Table 1-6 Configuration and Verification Commands
Task |
Command Syntax |
Display the IP address, subnet mask, and default gateway of a Windows PC |
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Display the IP address, subnet mask, and default gateway of a Windows PC, in addition to DNS servers, domain name, MAC address, and whether autoconfiguration is enabled |
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Display various IP-related parameters for a router interface, including the IP address and subnet mask that have been assigned |
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Identify any IP address conflicts a router configured as a DHCP server identifies, along with the method the router used to identify the conflicts (this is, via ping or gratuitous ARP) |
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Display IP addresses that an IOS DHCP server assigns, their corresponding MAC addresses, and lease expirations |
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Determine whether IPv6 is enabled on an interface, display the multicast groups the router interface is a member of, display the global and link-local unicast addresses associated with an interface, indicate whether EUI-64 was used or stateless autoconfiguration was used to obtain the IPv6 address for the interface, display whether RAs are suppressed for the interface, and display how devices connected to the same link as the interface will obtain an IPv6 address and how they will obtain other options |
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Display the IPv6 addresses that are being used by each of the DHCPv6 clients |
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Display which DHCPv6 pool is assigned to which interface on the router |
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Display the configured DHCPv6 pools on the router |
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Display a router's best route to the specified IP address |
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Display only the static routes in a routers routing table |
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Display a router's best route to the specified network if the specific route (with a matching subnet mask length) is found in the router's IP routing table |
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Display all routes in a router's IP routing table that are encompassed by the specified network address and subnet mask (This command is often useful when troubleshooting route summarization issues.) |
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Display information (for example, next-hop IP address and egress interface) required to forward a packet, similar to the output of the show ip route ip_address command (The output of this command comes from CEF. Therefore, routing protocol information is not presented in the output.) |
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Display information from a router's FIB showing the information needed to route a packet to the specified network with the specified subnet mask |
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Display the adjacency that will be used to forward a packet from the specified source IP address to the specified destination IP address (This command is useful if the router is load balancing across multiple adjacencies, and you want to see which adjacency will be used for a certain combination of source and destination IP addresses.) |
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Display the static IPv6 routes configured on a device |
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Display the Layer 3 IPv6 address-to-Layer 2 MAC address mappings |
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Display a router's ARP cache, containing IPv4 address-to-MAC address mappings |
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Table 2-9 Command Reference
Task |
Command Syntax |
Initialize EIGRP in classic configuration |
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Initialize EIGRP in named mode configuration |
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Define the EIGRP router ID |
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Configure an EIGRP-enabled interface to prevent neighbor adjacencies |
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Configure a keychain for EIGRP MD5 authentication |
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Configure MD5 authentication for an EIGRP interface |
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Configure SHA authentication for EIGRP named mode interfaces |
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Modify the interface delay for an interface |
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Modify the EIGRP K values |
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Modify the default number of EIGRP maximum paths that can be installed into the RIB |
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Modify the EIGRP variance multiplier for unequal-cost load balancing |
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Display the EIGRP-enabled interfaces |
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Display the EIGRP topology table |
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Display the configured EIGRP keychains and passwords |
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Display the IP routing protocol information configured on the router |
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Table 3-3 Command Reference
Task |
Command Syntax |
Modify the EIGRP hello interval and hold time per interface |
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Configure EIGRP network summarization |
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Statically set the EIGRP metrics for a specific network summary aggregate |
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Configure an EIGRP router as a stub router |
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Configure an EIGRP router as a stub site router |
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Disable EIGRP split horizon on an interface. |
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Filter routes for an EIGRP neighbor |
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Modify/increase path cost for routes |
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Display the EIGRP-enabled interfaces |
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Display the EIGRP topology table |
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Display the IP routing protocol information configured on the router |
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Table 4-3 Command Reference
Task |
Command Syntax |
Display the IPv4 routing protocols enabled on the router; for EIGRP, display autonomous system number, outgoing and incoming filters, K values, router ID, maximum paths, variance, local stub configuration, routing for networks, routing information sources, administrative distance, and passive interfaces |
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Show a router's EIGRP neighbors |
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Show detailed information about a router's EIGRP neighbors, including whether the neighbor is a stub router, along with the types of networks it is advertising as a stub |
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Display all of a router's interfaces that are configured to participate in an EIGRP routing process (with the exception of passive interfaces) |
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Display the interfaces participating in the EIGRP for IPv4 routing process, along with EIGRP hello and hold timers, whether the split horizon rule is enabled, and whether authentication is being used |
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Display the EIGRP configuration in the running configuration |
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Display the configuration of a specific interface in the running configuration (This is valuable when you are trying to troubleshoot EIGRP interface commands.) |
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Display the keychains and associated keys and key strings |
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Display IPv4 interface parameters; for EIGRP, verify whether the interface has joined the correct multicast group (224.0.0.10) and whether any ACLs applied to the interface might be preventing an EIGRP adjacency from forming |
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Display routes known to a router's EIGRP routing process, which are contained in the EIGRP topology table (The all-links keyword displays all routes learned for each network, and without the all-links keyword, only the successors and feasible successors are displayed for each network.) |
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Show routes known to a router's IP routing table that were injected by the router's EIGRP routing process |
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Display all EIGRP packets exchanged with a router's EIGRP neighbors or display only specific EIGRP packet types (for example, EIGRP hello packets) |
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Table 5-6 Command Reference
Task |
Command Syntax |
Initialize EIGRPv6 with classic configuration |
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Initialize EIGRPv6 with named mode configuration |
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Display all EIGRPv6 interfaces |
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Display established EIGRPv6 neighbors |
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Shows a router's EIGRPv6 neighbors |
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Display the IPv6 routing protocols enabled on the router; for EIGRP, display autonomous system number, outgoing and incoming filters, K values, router ID, maximum paths, variance, local stub configuration, interfaces participating in the routing process, routing information sources, administrative distance, and passive interfaces |
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Display all of a router's interfaces that are configured to participate in an EIGRPv6 routing process (with the exception of passive interfaces) |
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Display the interfaces participating in the EIGRPv6 routing process, along with EIGRP hello and hold timers, whether the split horizon rule is enabled, and whether authentication is being used |
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Display the IPv6 EIGRP configuration in the running configuration |
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Show detailed information about a router's EIGRP neighbors, including whether the neighbor is a stub router, along with the types of networks it is advertising as a stub |
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Show routes known to a router's IP routing table that were injected by the router's EIGRP routing process |
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Display detailed information about the EIGRP for IPv4 and IPv6 address families that are enabled on the router, including autonomous system number, K values, router ID, maximum paths, variance, local stub configuration, and administrative distance |
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Display the interfaces that are participating in the named EIGRP for IPv4 address family |
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Display the interfaces that are participating in the named EIGRPv6 address family |
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Display detailed information about the interfaces participating in the named EIGRP for IPv4 address family, including hello interval and hold time, whether split horizon is enabled, whether authentication is set, and statistics about hellos and packets |
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Display detailed information about the interfaces participating in the named EIGRPv6 address family, including hello interval and hold time, whether split horizon is enabled, whether authentication is set, and statistics about hellos and packets |
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Display the EIGRP for IPv4 neighbor relationships that have formed |
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Display the EIGRPv6 neighbor relationships that have formed |
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Display the EIGRP for IPv4 topology table for the address family |
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Display the EIGRPv6 topology table for the address family |
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Display all EIGRP packets exchanged with a router's EIGRP neighbors; however, the focus of the command can be narrowed to display only specific EIGRP packet types (for example, EIGRP hello packets) |
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Table 6-9 Command Reference
Task |
Command Syntax |
Initialize the OSPF process |
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Enable OSPF on network interfaces that match a specified network range for a specific OSPF area |
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Enable OSPF on an explicit specific network interface for a specific OSPF area |
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Configure a specific interface as passive |
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Configure all interfaces as passive |
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Advertise a default route into OSPF |
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Modify the OSPF reference bandwidth for dynamic interface metric costing |
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Configure the OSPF priority for a DR/BDR election |
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Statically configure an interface as a broadcast OSPF network type |
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Statically configure an interface as a nonbroadcast OSPF network type |
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Statically configure an interface as a point-to-point OSPF network type |
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Statically configure an interface as a point-to-multipoint OSPF network type |
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Enable OSPF authentication for an area |
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Define the plaintext password for an interface |
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Define the MD5 password for an interface |
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Restart the OSPF process |
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Display the OSPF interfaces on a router |
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Display the OSPF neighbors and their current states |
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Display the OSPF routes that are installed in the RIB |
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Table 7-9 Command Reference
Task |
Command Syntax |
Initialize the OSPF process |
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Display the generic LSA listings in a router's LSDB and the type and count for each type from an advertising router |
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Display the specific information for a Type 1, 2, 3, 4, 5, or 7 LSA |
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Configure all routers in an OSPF area as an OSPF stub area |
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Configure an ABR as a totally stubby area router ABR |
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Configure all routers in an OSPF area as an OSPF NSSA area |
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Configure an ABR for an NSSA with optional default route injection |
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Configure an ABR as a totally NSSA router ABR |
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Modify the OSPF reference bandwidth for dynamic interface metric costing |
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Statically set the OSPF metric for an interface |
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Configure internal route summarization on the first ABR attached to the source network |
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Configure external route summarization on the ASBR |
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Configure an OSPF virtual link to extend Area 0 |
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Table 8-6 Command Reference
Task |
Command Syntax |
Display the IPv4 routing protocols enabled on the device; for OSPFv2, display whether any route filters are applied, the RID, the number of areas the router is participating in, the types of areas, the maximum paths for load balancing, the network area command, the interfaces explicitly participating in the routing process, passive interfaces, routing information sources, and the AD |
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Display general OSPF parameters, including the PID, the RID, the reference bandwidth, the areas configured on the router, the types of areas (stub, totally stubby, NSSA, and totally NSSA), and area authentication |
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Display the interfaces that are participating in the OSPF process |
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Display detailed information about the interfaces participating in the OSPF process, including interface IPv4 address and mask, area ID, PID, RID, network type, cost, DR/BDR, priority, and timers |
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Display the OSPF devices that have formed a neighbor adjacency with the local router |
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Display the OSPF routes that have been installed in the IPv4 routing table |
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Display the OSPF link-state database |
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Provide information about the status of OSPF virtual links that are required for areas not physically adjacent to the backbone area (that is, Area 0) |
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Display real-time information related to the exchange of OSPF hello packets; useful for identifying mismatched OSPF timers and mismatched OSPF area types |
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Display the transmission and reception of OSPF packets in real time |
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Display real-time updates about the formation of an OSPF adjacency; useful for identifying mismatched area IDs and authentication information |
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Display real-time information about OSPF events, including the transmission and reception of hello messages and LSAs; might be useful on a router that appears to be ignoring hello messages received from a neighboring router |
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Table 9-7 Command Reference
Task |
Command Syntax |
Configure OSPFv3 on a router and enable it on an interface |
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Configure a specific OSPFv3 interface as passive |
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Configure all OSPFv3 interfaces as passive |
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Summarize an IPv6 network range on an ABR |
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Configure an OSPFv3 interface as point-to-point or broadcast network type |
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Display OSPFv3 interface settings |
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Display OSPFv3 IPv6 neighbors |
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Display OSPFv3 router LSAs |
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Display OSPFv3 network LSAs |
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Display OSPFv3 link LSAs |
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Table 10-4 Command Reference
Task |
Command Syntax |
Display the IPv4 routing protocols enabled on the device; for OSPFv2, display whether any route filters are applied, the RID, the number of areas the router is participating in, the types of areas, the maximum paths for load balancing, the network area command, the interfaces explicitly participating in the routing process, passive interfaces, routing information sources, and the AD |
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Display the IPv6 dynamic routing protocols enabled on the device; for OSPFv3, display the PID, the RID, the number of areas, the type of areas, the interfaces participating in the routing process, and redistribution information |
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Display general OSPF parameters, including the PID, the RID, the reference bandwidth, the areas configured on the router, the types of areas (stub, totally stubby, NSSA, and totally NSSA), and area authentication |
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Display the interfaces that are participating in the OSPF process |
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Display detailed information about the interfaces participating in the OSPF process, including the interface IPv4 address and mask, area ID, PID, RID, network type, cost, DR/BDR, priority, and timers |
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Display the OSPF devices that have formed a neighbor adjacency with the local router |
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Display the OSPF routes that have been installed in the IPv4/IPv6 routing table |
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Display general OSPFv3 parameters for IPv4 and IPv6 address families, including the PID, the RID, the reference bandwidth, the areas configured on the router, the types of areas (stub, totally stubby, NSSA, and totally NSSA), and area authentication |
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Display the interfaces that are participating in the OSPFv3 process and the AF they are participating in |
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Display detailed information about the interfaces participating in the OSPFv3 address families, including interface IPv4 and IPv6 addresses, area ID, PID, RID, network type, cost, DR/BDR, priority, and timers |
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Display the OSPFv3 neighbor adjacencies that have been formed for each AF |
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Display the OSPF link-state database |
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Display the OSPFv3 link-state database |
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Display real-time information related to the exchange of OSPF hello packets; useful for identifying mismatched OSPF timers and mismatched OSPF area types |
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Display the transmission and reception of OSPF packets in real time |
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Display real-time updates about the formation of an OSPF adjacency; useful for identifying mismatched area IDs and authentication information |
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Display real-time information about OSPF events, including the transmission and reception of hello messages and LSAs; might be useful on a router that appears to be ignoring hello messages received from a neighboring router |
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Table 11-8 Command Reference
Task |
Command Syntax |
Initialize the BGP router process |
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Statically configure the BGP router ID |
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Identify a BGP peer to establish a session with |
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Configure the BGP session timers |
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Specify the source interface for BGP packets for a specific BGP peer |
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Specify the ASN as which the BGP confederation should appear |
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Specify any BGP confederation member ASs that this router will peer with |
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Disable the automatic IPv4 address family configuration mode |
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Initialize a specific address family and sub-address family |
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Activate a BGP neighbor for a specific address family |
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Advertise a network into BGP |
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Modify the next-hop IP address on prefix advertisements to match that of the IP address used for the BGP session |
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Configure the associated BGP peer as a route reflector client |
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Display the contents of the BGP database |
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Display a summary of the BGP table and neighbor peering sessions |
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Display the negotiated BGP settings with a specific peer and the number of prefixes exchanged with that peer |
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Display the Adj-RIB-out BGP table for a specific BGP neighbor |
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Table 12-4 Command Reference
Task |
Command Syntax |
Configure a BGP aggregate IPv4 prefix |
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Configure a BGP aggregate IPv6 prefix |
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Configure a prefix list |
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Create a route map entry |
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Conditionally match in a route map using AS_Path |
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Conditionally match in a route map using an ACL |
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Conditionally match in a route map using a prefix list |
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Conditionally match in a route map using local preference |
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Filter routes to a BGP neighbor using an ACL |
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Filter routes to a BGP neighbor using a prefix list |
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Create an ACL based on the BGP AS_Path |
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Filter routes to a BGP neighbor using an AS_Path ACL |
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Associate an inbound or outbound route map to a specific BGP neighbor |
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Configure IOS-based routers to display the community in new format for easier readability of BGP communities |
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Create a BGP community list for conditional route matching |
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Set BGP communities in a route map |
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Configure the maximum number of BGP prefixes that a neighbor can receive |
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Define a BGP peer group |
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Initiate a route refresh for a specific BGP peer |
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Display the current BGP table, based on routes that meet a specified AS_Path regex pattern |
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Display the current BGP table, based on routes that meet a specified BGP community |
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Table 13-4 Command Reference
Task |
Command Syntax |
Set the weight in a route map |
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Set the weight for all routes learned from this neighbor |
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Set the local preference in a route map |
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Set the local preference for all routes learned from this neighbor |
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Enable the advertise of AIGP path attributes |
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Set the AIGP metric in a route map |
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Set AS_Path prepending in a route map |
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Set the origin using a route map |
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Set the MED using a route map |
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Set the MED to infinity when the MED is not present |
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Set the MED to the default value when the MED is not present |
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Ensure that MED is always compared, regardless of AS_Path |
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Group together paths with identical AS_Path values as part of the best-path identification process |
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Configure eBGP multipathing |
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Configure iBGP multipathing |
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Table 14-3 Command Reference
Task |
Command Syntax |
Display a router's BGP RID, ASN, information about the BGP's memory usage, and summary information about IPv4/IPv6 unicast BGP neighbors |
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Display detailed information about all the IPv4/IPv6 BGP neighbors of a router |
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Display the IPv4/IPv6 network prefixes present in the IPv4/IPv6 BGP table |
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Show routes known to a router's IPv4/IPv6 routing table that were learned from BGP |
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Show real-time information about BGP events, such as the establishment of a peering relationship |
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Show real-time information about BGP updates sent and received by a BGP router |
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Display updates that occur in a router's IP routing table (This command is not specific to BGP.) |
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Table 15-8 Command Reference
Task |
Command Syntax |
Configure a prefix list |
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Create a route map entry |
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Conditionally match in a route map using AS_Path |
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Conditionally match in a route map using an ACL |
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Conditionally match in a route map using a prefix list |
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Conditionally match in a route map using local preference |
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Prepend the AS_Path for the network prefix with the pattern specified or from multiple iterations from neighboring autonomous systems |
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Set the next-hop IP address for any matching prefix |
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Set the BGP PA local preference |
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Set a numeric tag (0 through 4294967295) for identification of networks by other routers |
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Table 16-7 Command Reference
Task |
Command Syntax |
Redistribute the source routing protocol into a destination routing protocol |
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Set the default EIGRP seed metric for redistributed prefixes |
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Allow for the redistribution of iBGP learned prefixes into an IGP |
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Table 17-4 Command Reference
Task |
Command Syntax |
Display the IPv4 sources of routing information that are being redistributed into the IPv4 routing protocols enabled on the device |
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Display the IPv6 sources of routing information that are being redistributed into the IPv6 routing protocols enabled on the device |
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Show which IPv4 routes have been redistributed into the IPv4 EIGRP process on the boundary router |
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Show which IPv6 routes have been redistributed into the IPv6 EIGRP process on the boundary router |
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Show which IPv4 routes have been redistributed into the OSPFv2 process; they are represented as Type 5 or Type 7 LSAs |
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Show which IPv6 routes have been redistributed into the OSPFv3 process; they are represented as Type 5 or Type 7 LSAs |
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Display the IPv4 and IPv6 BGP learned routes; routes originally learned through redistribution have a question mark (?) in the Path column |
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Display a router's BGP router ID, autonomous system number, information about the BGP's memory usage, and summary information about IPv4 unicast BGP neighbors |
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Display detailed information about all the IPv4 BGP neighbors of a router |
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Table 18-3 Command Reference
Task |
Command Syntax |
Define a VRF instance and enter VRF configuration mode for the instance (in global configuration mode) |
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Associate an interface or a subinterface with a VRF instance (in interface configuration mode) |
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Display configured VRF instances and associated router interfaces |
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Display the routes in the global routing table |
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Display the routes in the routing table for the VRF specified in the command |
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Display all VRF-enabled interfaces on the router, including their IP addresses and whether the protocol is up or down |
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Test IP connectivity for a specific VRF |
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Table 19-14 Command Reference
Task |
Command Syntax |
Specify the source IP address or interface used for encapsulating packets for a tunnel |
|
Specify the destination IP address for establishing a tunnel |
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Convert a GRE tunnel into an mGRE tunnel |
|
Enable NRHP and uniquely identify a DMVPN tunnel locally |
|
Define a tunnel key globally on a DMVPN tunnel interface to allow routers to identify when multiple tunnels use the same encapsulating interface |
|
Enable plaintext NHRP authentication |
|
Associate a front door VRF instance to a DMVPN tunnel interface |
|
Allow for an NHRP client to register with a different IP address before timing out at the hub |
|
Enable the NHRP redirect function on a DMVPN hub tunnel interface |
|
Enable the ability to install NHRP shortcuts into a spoke router's RIB |
|
Enable the mapping of multicast on a DMVPN hub tunnel interface |
|
Specify the NHRP NHS, NBMA address, and multicast mapping on a spoke |
|
Display the tunnel interface state and statistics |
|
Display DMVPN tunnel interface association, NHRP mappings, and IPsec session details |
|
Display the NHRP cache for a router |
|
Display the NHRP shortcut that is installed for an overridden route |
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Table 20-4 Command Reference
Task |
Command Syntax |
Configure an IKEv2 keyring |
|
Configure an IKEv2 profile |
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Configure an IPsec transform set |
|
Configure an IPsec profile |
|
Encrypt the DMVPN tunnel interface |
|
Modify the default IPsec replay window size |
|
Enable IPsec NAT keepalives |
|
Display the IKEv2 profile |
|
Display the IPsec profile |
|
Table 21-3 Command Reference
Task |
Command Syntax |
Display all the access lists configured on the device |
|
Display all the IPv4 access lists configured on the device |
|
Display all the IPv6 access lists configured on the device |
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Display the inbound and outbound IPv4 access lists applied to an interface |
|
Display the inbound and outbound IPv6 access lists applied to an interface |
|
Display any time ranges that have been configured on the device |
|
Display the date and time on the device |
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Table 22-3 Command Reference
Task |
Command Syntax |
Display the configuration of the local usernames and passwords on the device, the AAA commands that have been configured, and the vty line configuration |
|
Display the authentication process in real time |
|
Display the RADIUS authentication process in real time |
|
Display the local authentication process in real time |
|
Enable AAA services on the router |
|
Create a username and password in the local username and password database |
|
Create a method list for AAA login purposes using a group of AAA servers for authentication with fallback to the local username and password database if the servers are not reachable |
|
Apply a AAA method list to a vty or console line in line configuration mode |
|
Configure uRPF on an interface in interface configuration mode |
|
Display all configured ACLs on the router |
|
Display all configured class maps on the router |
|
Display all configured policy maps on the router |
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Verify the applied policy map, the class maps in the order in which they will be applied, the match conditions of the class maps, and the policies that are applied to the traffic that is matched |
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Table 23-3 Command Reference
Task |
Command Syntax |
Display the ingress and egress allowed transport protocols on vty line |
|
Display only the ingress allowed transport protocols on a vty line |
|
Display the vty line configuration in the running configuration |
|
Display the lines that are currently being used for management connectivity |
|
Display whether SSH is enabled or disabled, the version of SSH enabled, and the SSH RSA key |
|
Display the SSHv1 and SSHv2 connections to the local device |
|
Display information related to syslog, including level settings and messages logged for console, monitor, buffer, and traps logging; verify the buffer size and its contents for buffer logging and the IP address/port number of the syslog server |
|
Display the conditional debug commands that have been configured on the router |
|
Display SNMP group information, including the group name, the security mode, the read and write views, and any applied ACLs |
|
Display any configured SNMP users; output includes the username, the authentication protocol used, the encryption protocol used, and the group the user is applied to |
|
Display the local configuration of the SNMP server, including the IP address, UDP port, type, attached user, and security model being used |
|
Display the SNMP views configured on the local device |
|
Display which IP SLA operations are supported on the platform, how many operations are configured, and how many operations are currently active |
|
Display the IP SLA configuration values for the IP SLA instances |
|
Display the IP SLA operational results of IP SLA instances |
|
Display the operational results of the IP SLA responder |
|
Display the configured tracking objects on the local device, including the current state and the service or feature it is attached to |
|
Display the local NetFlow flow cache as well as the configured timers |
|
Display the interfaces enabled for NetFlow and the direction in which they are capturing information |
|
Display the NetFlow exporter configuration, including the source and destination addresses, port number, and version of NetFlow |
|
Display all user-defined Flexible NetFlow flow records that are configured on the local device |
|
Display the locally configured Flexible NetFlow flow monitors; verify the attached flow record and flow exporter as well as the configured timers |
|
Display the interfaces enabled for Flexible NetFlow and the direction in which they are capturing information |
|
Display the Flexible NetFlow exporter configuration, including the source and destination addresses, port number, and version of NetFlow |
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18.189.193.172