When PIMv2 devices interoperate with PIMv1 devices, Auto-RP should have already been deployed. A PIMv2
BSR that is also an Auto-RP mapping agent automatically advertises the RP elected by Auto-RP. That is,
Auto-RP sets its single RP on every router or multilayer device in the group. Not all routers and devices in
the domain use the PIMv2 hash function to select multiple RPs.
Dense-mode groups in a mixed PIMv1 and PIMv2 region need no special configuration; they automatically
interoperate.
Sparse-mode groups in a mixed PIMv1 and PIMv2 region are possible because the Auto-RP feature in PIMv1
interoperates with the PIMv2 RP feature. Although all PIMv2 devices can also use PIMv1, we recommend
that the RPs be upgraded to PIMv2. To ease the transition to PIMv2, we recommend:
•
Using Auto-RP throughout the region.
•
Configuring sparse-dense mode throughout the region.
If Auto-RP is not already configured in the PIMv1 regions, configure Auto-RP.
Related Topics
PIM Versions, on page 127
Restrictions for Configuring PIM Stub Routing
•
The IP services image contains complete multicast routing.
•
Only directly connected multicast (IGMP) receivers and sources are allowed in the Layer 2 access
domains. The PIM protocol is not supported in access domains.
•
In a network using PIM stub routing, the only allowable route for IP traffic to the user is through a device
that is configured with PIM stub routing.
•
The redundant PIM stub router topology is not supported. Only the nonredundant access router topology
is supported by the PIM stub feature.
•
PIM stub routing is supported when running the IP Base and IP Services feature sets.
Related Topics
Enabling PIM Stub Routing (CLI), on page 141
PIM Stub Routing, on page 128
Restrictions for Configuring Auto-RP and BSR
Take into consideration your network configuration, and the following restrictions when configuring Auto-RP
and BSR:
Restrictions for Configuring Auto-RP
The following are restrictions for configuring Auto-RP (if used in your network configuration):
•
Auto-RP is not supported when running the LAN Base feature set.
•
If you configure PIM in sparse mode or sparse-dense mode and do not configure Auto-RP, you must
manually configure an RP.
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
OL-32598-01 123
Configuring PIM
Restrictions for Configuring PIM Stub Routing
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