IS IS IPv6 Single Topology
Introduction
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
RP/0/0/CPU0:XR12(config-isis-af)#single-topology