Configuration Exercise: Configuring an IPv6 Network Using Cisco Routers

Complete the following exercise to configure IPv6 on a network to practice skills learned in this chapter.

NOTE

Configuration Exercises allow you to practice your skills and knowledge by configuring IPv6 on a Cisco router using commands presented in this chapter. In the exercise presented here, only one router with multiple Fast Ethernet interfaces provides IPv6 connectivity to nodes on a network. This exercise assumes that you have minimal experience with the command-line interface (CLI) and that you can download a new Cisco IOS Software from the Cisco website.


Objectives

In the following exercise, you will complete the following tasks:

  1. Install a new Cisco IOS Software with IPv6 support on a Cisco router. The filename of the new image is c2600-is-mz.2001120.

  2. Enable IPv6 on the Cisco router.

  3. Assign IPv6 addresses to interfaces.

  4. Verify interfaces and addresses assigned.

Network Architecture for Tasks 1 and 2

Figure 2-22 shows a basic network architecture used for Tasks 1 and 2.

Figure 2-22. Network Architecture for Enabling IPv6 on a Router


Command List

In this configuration exercise, you will use the commands shown in Table 2-29. Refer to this list during the exercise.

Table 2-29. Configuration Exercise Command List
CommandDescription
copy running-config startup-configSaves a current configuration to NVRAM.
copy tftp flashInstalls a new IOS on a router using a TFTP server.
hostname nameConfigures the router's name.
interface interface-type interface-numberSpecifies an interface type and interface number.
ip address ip-address network-maskConfigures an IPv4 address to an interface.
ip cefEnables CEF for IPv4.
ipv6 cefEnables CEF for IPv6.
ipv6 unicast-routingEnables IPv6 traffic forwarding.
ipv6 address ipv6-address/prefix-lengthConfigures an IPv6 static address with a prefix length.
no ip address ip-address network-maskDisables an IPv4 address.
show interface interface-type interface-numberDisplays general information about the interface.
show ipv6Displays general information about IPv6 support on a router.
show ipv6 interface interface-type interface-numberDisplays the IPv6 configuration applied to an interface type and interface number.

Task 1: Basic Router Setup and Installing New Cisco IOS Software with IPv6 Support

Configure a basic setup on Router A to install the new IOS on the router with IPv6 support. The TFTP server is connected to the same link-layer network as the Fast Ethernet (FE) 0/0 interface. The TFTP server can only be reached over IPv4 using 192.168.1.1 as the IPv4 address.

Step 1.
The name of your router is Router A. Set the host name on your router. Which command is used to perform this task?

The following shows how to configure the host name on Router A:

Router#conf t
Router(config)#hostname RouterA
Router(config)#exit
RouterA#

Step 2.
Assign an IPv4 address with the netmask value shown in the following table to the router's interface FE 0/0. Other interfaces are not used in the basic router setup task. What command used on the Cisco router configures an IPv4 address on a network interface?

Router's InterfaceIPv4 AddressNetmask
Fast Ethernet 0/0192.168.1.2255.255.255.0

The following shows how to configure an IPv4 address on interface FE 0/1 of Router A:

RouterA(config)#interface fastEthernet 0/0
RouterA(config-if)#ip address 192.168.1.2 255.255.255.0
RouterA(config-if)#exit
RouterA(config)#exit

Step 3.
On the router, enter the command to download and install a new IOS with IPv6 support using a TFTP server. What command installs an IOS from a TFTP server?

The following command shows how to install a new IOS on a router using a TFTP server:

RouterA#copy tftp flash
Address or name of remote host []? 192.168.1.1
Source filename []? c2600-is-mz.20011207
Destination filename [c2600-is-mz.20011207]?
Do you want to over write? [confirm] ENTER
Accessing tftp://192.168.1.1/c2600-is-mz.20011207...
Erase flash: before copying? [confirm] ENTER
Erasing the flash filesystem will remove all files! Continue? [confirm]
Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ...erased
Erase of flash: complete
Loading c2600-is-mz.20011207 from 192.168.1.1 (via FastEthernet0/0):
<output omitted>
[OK - 12460516/24920064 bytes]
Verifying checksum...  OK (0xE9F1)
12460516 bytes copied in 106.92 secs (117552 bytes/sec)

Step 4.
As soon as the new image is successfully downloaded, reboot the router, log into enable mode, and verify that the IPv6-enabled image is fully installed in the router. What command verifies IPv6 support in the IOS?

The following command can be used to verify whether IPv6 support is enabled:

RouterA#show ipv6 ?
  access-list  Summary of access lists
  cef          Cisco Express Forwarding for IPv6
  interface    IPv6 interface status and configuration
  mtu          MTU per destination cache
  neighbors    Show IPv6 neighbor cache entries
  prefix-list  List IPv6 prefix lists
  protocols    IPv6 Routing Protocols
  rip          RIP routing protocol status
  route        Show IPv6 route table entries
  routers      Show local IPv6 routers
  traffic      IPv6 traffic statistics
  tunnel       Summary of IPv6 tunnels
RouterA#show ipv6

NOTE

If a syntax error occurs here, it indicates that the router is not running an IOS with IPv6 support.

Step 5.
You may remove the IPv4 address on interface FE 0/1, because this configuration exercise is entirely focused on IPv6. What command used on the Cisco router removes an IPv4 address on a network interface?

The following removes the IPv4 address on interface FE 0/0 of Router A:

RouterA(config)#interface fastEthernet 0/0
RouterA(config-if)#no ip address 192.168.1.2 255.255.255.0
RouterA(config-if)#exit
RouterA(config)#exit

Step 6.
Save the current configuration to NVRAM:

RouterA#copy running-config startup-config
Destination filename [startup-config]?
Building configuration...
[OK]

Task 2: Enable IPv6 on the Router and Configure Static Addresses

Complete the following steps:

Step 1.
Enter the command to enable IPv6 traffic forwarding on the router to forward unicast IPv6 packets between interfaces. Then enable CEFv6 in the router. What commands will you use?

RouterA#conf t
RouterA(config)#ipv6 unicast-routing
RouterA(config)#ip cef
RouterA(config)#ipv6 cef
RouterA(config)#exit

Step 2.
Verify the hardware address (Ethernet MAC address) of all interfaces on Router A, and calculate the link-local address of each interface. Fill in the following table. What command gets the hardware address of each interface?

InterfaceHardware AddressLink-Local Address
Fast Ethernet 0/0  
Fast Ethernet 0/1  

RouterA#show interface fastEthernet 0/0
FastEthernet0/0 is up, line protocol is up
  Hardware is AmdFE, address is 0050.3ee4.4c00 (bia 0050.3ee4.4c00)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Half-duplex, 10Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:03:01, output 00:00:07, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  <data omitted>
..
RouterA#show interface fastEthernet 0/1
FastEthernet0/1 is administratively down, line protocol is down
  Hardware is AmdFE, address is 0050.3ee4.4c01 (bia 0050.3ee4.4c01)
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Auto-duplex, Auto Speed, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo

Step 3.
Suppose that the router acts as an IPv6 host. Configure one static unicast IPv6 address per interface. Use the addresses in the following table to configure the router's interfaces. What command assigns one IPv6 address per interface?

InterfacesIPv6 Addresses
Fast Ethernet 0/0FEC0:0:0:1001::1/128
Fast Ethernet 0/1FEC0:0:0:1002::1/128

RouterA#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
RouterA(config)#interface fastEthernet 0/0
RouterA(config-if)#ipv6 address fec0:0:0:1001::1/128
RouterA(config-if)#interface fastEthernet 0/1
RouterA(config-if)#ipv6 address fec0:0:0:1002::1/128
RouterA(config)#exit

Step 4.
Verify the static and link-local addresses of each interface. What command displays IPv6 addresses used on an interface? Then compare the link-local addresses with those calculated in Step 2. Are they similar?

RouterA#show ipv6 interface fastEthernet 0/0
FastEthernet0/0 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::250:3EFF:FEE4:4C00
  Global unicast address(es):
    FEC0:0:0:1001::1, subnet is FEC0:0:0:1001::/128
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::1:FF00:1
    FF02::1:FFE4:4C00
  MTU is 1500 bytes
  ICMP error messages limited to one every 100 milliseconds
  ICMP redirects are enabled
  ND DAD is enabled, number of DAD attempts: 1
  ND reachable time is 30000 milliseconds
  ND advertised reachable time is 0 milliseconds
  ND advertised retransmit interval is 0 milliseconds
  ND router advertisements are sent every 200 seconds
  ND router advertisements live for 1800 seconds
  Hosts use stateless autoconfig for addresses.

RouterA#show ipv6 interface fastEthernet 0/1
FastEthernet0/1 is administratively down, line protocol is up
  IPv6 is enabled, link-local address is FE80::250:3EFF:FEE4:4C01
  Global unicast address(es):
    FEC0:0:0:1002::1, subnet is FEC0:0:0:1002::/128
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::1:FF00:1
    FF02::1:FFE4:4C01
  MTU is 1500 bytes
  ICMP error messages limited to one every 100 milliseconds
  ICMP redirects are enabled
  ND DAD is enabled, number of DAD attempts: 1
  ND reachable time is 30000 milliseconds
  ND advertised reachable time is 0 milliseconds
  ND advertised retransmit interval is 0 milliseconds
  ND router advertisements are sent every 200 seconds
  ND router advertisements live for 1800 seconds
  Hosts use stateless autoconfig for addresses.

Step 5.
Save the current configuration to NVRAM:

RouterA#copy running-config startup-config
Destination filename [startup-config]?
Building configuration...

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