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NOTE: Whenever you make IS-IS configuration changes, clear the IS-IS process (re-started) using the clear isis
command. The clear isis command must include the tag for the ISIS process. The following example shows the
response from the router:
Dell#clear isis *
% ISIS not enabled.
Dell#clear isis 9999 *
You can configure IPv6 IS-IS routes in one of the following three different methods:
Congruent Topology You must configure both IPv4 and IPv6 addresses on the interface. Enable the ip router isis
and ipv6 router isis commands on the interface. Enable the wide-metrics parameter in router isis configuration
mode.
Multi-topology You must configure the IPv6 address. Configuring the IPv4 address is optional. You must enable the
ipv6 router isis command on the interface. If you configure IPv4, also enable the router isis command. In router
isis configuration mode, enable multi-topology under address-family ipv6 unicast.
Multi-topology Transition You must configure the IPv6 address. Configuring the IPv4 address is optional. You must
enable the ipv6 router isis command on the interface. If you configure IPv4, also enable the ip router isis
command. In router isis configuration mode, enable multi-topology transition under address-family ipv6 unicast.
Figure 63. IPv6 IS-IS Sample Topography
The following is a sample configuration for enabling IPv6 IS-IS.
IS-IS Sample Configuration Router 1
R1(conf)#interface Loopback 0
R1(conf-if-lo-0)#ip address 192.168.1.1/24
R1(conf-if-lo-0)#ipv6 address 2001:db8:9999:1::/48
R1(conf-if-lo-0)#ip router isis 9999
R1(conf-if-lo-0)#no shutdown
R1(conf-if-lo-0)#router isis 9999
R1(conf-router_isis)#is-type level-1
R1(conf-router_isis)#net FF.F101.0002.0C00.1111.00
R1(conf-router_isis)#ipv6 route 2001:db8:9999:2::/128 2001:db8:1021:2::
R1(conf)#ipv6 route 2001:db8:9999:3::/128 2001:db8:1022:3::
R1(conf)#ip route 192.168.1.2/32 10.0.12.2
R1(conf)#ip route 192.168.1.3/32 10.0.13.3
R1(conf)#interface GigabitEthernet 1/21
R1(conf-if-gi-1/21)#ip address 10.0.12.1/24
R1(conf-if-gi-1/21)#ipv6 address 2001:db8:1022:1::/48
R1(conf-if-gi-1/21)#isis circuit-type level-1
Intermediate System to Intermediate System
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