Implementing Multicast Routing on Cisco IOS XR Software Cisco ASR 9000 Series Routers
How to Implement Multicast Routing
MCC-50
Multicast Configuration Guide
OL-
Configuring Multitopology Routing
This set of procedures configures multitopology routing, which is used by PIM for reverse-path
forwarding (RPF) path selection.
• “Configuring a Global Topology and Associating It with an Interface” (required)
For information, see Cisco IOS XR Routing Configuration Guide.
• “Enabling an IS-IS Topology” (required)
For information, see Cisco IOS XR Routing Configuration Guide.
• “Placing an Interface in a Topology in IS-IS” (required)
For information, see Cisco IOS XR Routing Configuration Guide.
• “Configuring a Routing Policy” (required)
For information, see Cisco IOS XR Routing Configuration Guide.
• “Configuring an RPF Topology in PIM” section on page MCC-51 (required)
For an example of multitopology routing, see Configuring Multitopology Routing: Example,
page MCC-90.
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 protocols are currently supported.
• 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 any of the following
configurations:
–
Open Shortest Path First (OSPF)
–
Intermediate System-to-Intermediate System (IS-IS)
–
Multiprotocol Border Gateway Protocol (MBGP)
Note 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.
Information About Multitopology Routing
Configuring multitopology networks requires the following tasks:
• “Configuring a Global Topology and Associating It with an Interface” (required)
For information, see Cisco IOS XR Routing Configuration Guide.
• “Enabling an IS-IS Topology” (required)
For information, see Cisco IOS XR Routing Configuration Guide.
• “Placing an Interface in a Topology in IS-IS” (required)
For information, see Cisco IOS XR Routing Configuration Guide.
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