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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Multi-Topology IS-IS

Multi-topology IS-IS (MT IS-IS) allows you to create multiple IS-IS topologies on a single router with separate databases.

Use this feature to place a virtual physical topology into logical routing domains, which can each support different routing and security policies.

All routers on a LAN or point-to-point must have at least one common supported topology when operating in Multi-Topology IS-IS mode. If IPv4 is the common supported topology between those two routers, adjacency can be formed. All topologies must share the same set of L1-L2 boundaries.

You must implement a wide metric-style globally on the autonomous system (AS) to run multi-topology IS-IS for IPv6 because the Type, Length, Value (TLVs) used to advertise IPv6 information in link-state packets (LSPs) are defined to use only extended metrics.

The multi-topology ID is shown in the first octet of the IS-IS packet. Certain MT topologies are assigned to serve predetermined purposes:
  • MT ID #0: Equivalent to the “standard” topology.
  • MT ID #1: Reserved for IPv4 in-band management purposes.
  • MT ID #2: Reserved for IPv6 routing topology.
  • MT ID #3: Reserved for IPv4 multicast routing topology.
  • MT ID #4: Reserved for IPv6 multicast routing topology.
  • MT ID #5: Reserved for IPv6 in-band management purposes.

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