IS IS IPv6 Single Topology


IPv6 can operate in ISIS either using single topology or multi-topology.

Single Topology

  • Using single topology IPv4 and IPv6 run on the same links in dual mode.
  • Each links should have IPv4 and IPv6.
  • The SPF topology is the same for both IPv4 and IPv6.
  • By defaul XR will run in Multi-Topology, while IOS will run in Single-topology.
  • Does not require changing of the metric-style to wide.
RP/0/0/CPU0:XR12(config)#router isis 1
RP/0/0/CPU0:XR12(config-isis)#address-family ipv6 


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