Configuring Multitopology Routing; Restrictions For Configuring Multitopology Routing; Information About Multitopology Routing - Cisco ASR 9000 Series Configuration Manual

Implementing IS-IS
Command or Action
Example:
RP/0/RSP0/CPU0:router# show isis
interface GigabitEthernet 0/1/0/1
Step 15 show isis [ instance instance-id ] topology
[ systemid system-id ] [ level { 1 | 2 }] [
summary ]
Example:
RP/0/RSP0/CPU0:router# show isis topology

Configuring Multitopology Routing

This set of procedures configures multitopology routing, which is used by PIM for reverse-path forwarding
(RPF) path selection.

Restrictions for Configuring Multitopology Routing

• Only the default VRF is currently supported in a multitopology solution.
• Only protocol-independent multicast (PIM) and intermediate system-intermediate system (IS-IS) routing
• Topology selection is restricted solely to (S, G) route sources for both SM and SSM. Static and IS-IS
Although both multicast and unicast keywords are available when using the address-family {ipv4 |
Note
ipv6} command in routing policy language (RPL), only topologies under multicast SAFI can be configured
globally.

Information About Multitopology Routing

Configuring multitopology networks requires the following tasks:
OL-30423-03
protocols are currently supported.
are the only interior gateway protocols (IGPs) that support multitopology deployment.
For non-(S, G) route sources like a rendezvous point or bootstrap router (BSR), or when a route policy
is not configured, the current policy default remains in effect. In other words, either a unicast-default or
multicast-default table is selected for all sources, based on OSFP/IS-IS/Multiprotocol Border Gateway
Protocol (MBGP) configuration.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
Purpose
(Optional) Displays a list of connected routers in all areas.
Configuring Multitopology Routing
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