Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 771)

Multi-Service IronWare Routing Configuration Guide 743
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IPv6 IS-IS Multi-Topology
FIGURE 37 IS-IS non-congruent topology
Configuration considerations for IPv6 IS-IS MT
The following are the configuration considerations:
• The wide metric style must be configured before enabling IPv6 IS-IS MT.
• IPv4, IPv6, or IPv4 and IPv6 configured on the same interface must run on the same IS-IS level.
• Enabling or disabling IPv6 IS-IS MT clears all adjacencies, LSP databases, and IPv6 IS-IS
routes.
• All routers on a point-to-point or a broadcast interface must support at least one common
topology (IPv4 or IPv6), when MT is enabled.
Migrating to IPv6 IS-IS MT
The following steps must be performed to migrate from a non-MT environment to an MT
environment.
1. Assume that the entire network is not an IPv6 IS-IS MT environment, and ensure that all the
routes are correct.
2. Use the multi-topology transition command to enable transition mode on each router one by
one, and ensure that all the routes are correct.
3. After all the routers are in transition mode, use the no multi-topology transition command to
disable transition mode on each router one by one. Ensure that all the routes are correct.
4. Change the topology to make IPv4 and IPv6 different.