4000 Router Series IP Multicast Configuration Guide

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Analysis

• RPs are the core of an IPv6 PIM-SM domain. An RP provides services for a specific IPv6 multicast

group, and multiple RPs can coexist on a network. Make sure the RP information on all routers is

exactly the same to map a specific IPv6 multicast group to the same RP. Otherwise, IPv6 multicast

forwarding fails.

• If a static RP is configured, use the same static RP configuration on all routers on the entire network.

Otherwise, IPv6 multicast forwarding fails.

Solution

1. Use display ipv6 routing-table to verify that an IPv6 unicast route to the RP is available on each

router.

2. Use display ipv6 pim rp-info to verify that the dynamic RP information is consistent on all routers.

3. Use display ipv6 pim rp-info to verify that the same static RPs are configured on all routers on the

network.

An RPT cannot be built or IPv6 multicast source registration fails

in IPv6 PIM-SM

Symptom

The C-RPs cannot unicast advertisement messages to the BSR. The BSR does not advertise BSMs

containing C-RP information and has no IPv6 unicast route to any C-RP. An RPT cannot be correctly

established, or the source-side DR cannot register the IPv6 multicast source with the RP.

Analysis

• The C-RPs periodically send advertisement messages to the BSR by unicast. If a C-RP has no IPv6

unicast route to the BSR, it cannot send advertisement messages to the BSR, and the BSR cannot

advertise BSMs containing the information of the C-RP.

• If the BSR does not have an IPv6 unicast route to a C-RP, it discards the advertisement messages

from the C-RP. Therefore, the BSR cannot advertise BSMs containing the information of the C-RP.

• RPs are the core of an IPv6 PIM-SM domain. Make sure the RP information on all routers is exactly

the same to map a specific IPv6 multicast group to the same RP, and that an IPv6 unicast route to the

RP are available on the routers.

Solution

1. Use display ipv6 routing-table to verify that the IPv6 unicast routes to the C-RPs and the BSR are

available on each router and that a route is available between each C-RP and the BSR. Make sure

each C-RP has an IPv6 unicast route to the BSR, the BSR has an IPv6 unicast route to each C-RP, and

each router on the network has IPv6 unicast routes to the C-RPs.

2. Use display ipv6 pim bsr-info to verify that the BSR information exists on each router, and then use

display ipv6 pim rp-info to verify that the RP information is correct on each router.

3. Use display ipv6 pim neighbor to verify that IPv6 PIM neighboring relationship has been correctly

established among the routers.