/mcp<#root> router3# show run | i rp ip pim rp-address 10.2.1.1 override router3#configure terminal Enter configuration commands, one per line. End with CNTL/Z. router3(config)#no ip pim rp-address 10.2.1.1 override router3(config)#exit router3#
After the configuration on router3 is corrected, router3 refers to the correct RP address and the error message stops.
<#root> router3# show ip pim rp map PIM Group-to-RP Mappings
Group(s) 224.0.0.0/4 RP 10.1.1.1 (?), v2v1 Info source: 10.1.1.1 (?), elected via Auto-RP Uptime: 00:30:45, expires: 00:02:02 router3#
Duplicate Multicast Packet Streams are Received Cause 1 Duplicate multicast packets are received when two routers are configured in dense mode. In dense mode, the device periodically floods the stream. After flooding, it prunes off the interfaces where the steam is not wanted. The two routers also go through the assertion process and decide who is the forwarder. Every time the timers go off this happens, and until this process is complete, both routers forward the stream. This causes the application to receive duplicate multicast streams. Possible Fix 1 This issue can be resolved if you have one of the routers configured for multicast routing and to configure the other router to be the RP in upstream. Configure it in order to convert the stream into sparse mode before the stream comes into the router. This can prevent duplicate packets from reaching the application. It is not a part of the networks responsibility to ensure that no duplicate packets ever reach an end host. It is a part of the responsibility of the application to handle duplicate packets and ignore unneeded data. Cause 2 This issue can occur in Cisco Catalyst 6500 switches, which are configured for egress multicast replication mode and can be triggered by removal and re-insertion of any line cards [OIR]. After OIR, the Fabric Port