•
Topology selection is restricted solely to (S, G) route sources for both SM and SSM. Static and IS-IS
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.
Although both multicast and unicast keywords are available when using the address-family {ipv4 |
ipv6} command in routing policy language (RPL), only topologies under multicast SAFI can be configured
globally.
Note
Information About Multitopology Routing
Configuring multitopology networks requires the following tasks:
Configuring a Global Topology and Associating It with an Interface
Follow these steps to enable a global topology in the default VRF and to enable its use with a specific interface.
SUMMARY STEPS
1.
configure
2.
address-family { ipv4 | ipv6 } multicast topology topo-name
3.
maximum prefix limit
4.
interface type interface-path-id
5.
address-family { ipv4 | ipv6 } multicast topology topo-name
6.
Repeat Step 4 and Step 5 until you have specified all the interface instances you want to associate with
your topologies.
7.
commit
DETAILED STEPS
PurposeCommand or Action
configure
Step 1
Configures a topology in the default VRF table that
will be associated with a an interface.
address-family { ipv4 | ipv6 } multicast topology topo-name
Example:
RP/0/RSP0/CPU0:router(config)# address-family ipv4
multicast topology green
Step 2
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
360
Implementing IS-IS
Configuring Multitopology Routing
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