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44.2.4 PIM-SM6 Troubleshooting
When configuring and using PIM-SM prot ocol, PIM-SM prot ocol may fail to work normally due to physical
connections, incorrect configuration and so on. So, users shall note the following points:
Assure the physical connection is correct.
Assure the Protocol of Interface and Link is UP (use show interface command);
Unicast route shall be used to carry out RPF examination for multicast protocol. So the correctness of
unicast route shall be guaranteed above all.
PIM-SM P rotocol requires supports of RP and BS R, therefore you should use show ipv6 pim bs r-router
first to see if there is BSR information. If not, you need to check if there is unicast routing leading to BSR.
Use show ipv6 pim rp-hash command to check if RP information is correct; if there is no RP information,
you still need to check unicast routing;
If all attempts fail t o solve the problems on PIM-SM, then use debug commands such as debug ipv6 pim/
debug ipv6 pim bsr, copy DEBUG information in 3 minutes and send to Technology Service Center.
44.3 ANYCAST RP v6 Configuration
44.3.1 Introduction to ANYCAST RP v6
Anycast RP v6 is a technology based on PIM protocol, which provides redundancy in order to recover as soon
as possible once an RP bec omes unusable.
The kernel concept of A nycast RP v6 is that the RP addresses configured all over the whole net work exist on
multiple multicast servers (the most common situation is that every device providing A NYCAS T RP uses
LOOPBACK int erface, and using the longest mask to configures RP addresses on this interface), while the
unicast routing algorithm will make sure that PIM routers can always find the nearest RP, thus , providing a
shorter and faster way to find RP in a larger network., Once an RP being used becomes unusable, the unicast
routing algorit hm will ensure that the P IM router can find a new RP path fast enough to recover the multicast
server in time. Multiple RP will cause a new problem that is if the multicast source and the receivers are
registered to different RP, some receivers will not be able to receive data of multicast source (obviously, the
register messages only prefer the nearest RP). So, in order to keep the communication between all RP,
Anycast RP defines that the nearest RP to the multicast source should forward the source register messages
to all the other RP to guarantee that all joiners of the RP can find the multicast source.
The method to realize the PIM-protocol-based Anycast RP is that: maintaining an ANY CAS T RP list on every
switch configured with Anycast RP and using another address as the label to identify each other. When one
Anycast RP device receives a register message, it will send the register message to other Anycast RP
devic es while using its own address as the source address, to notify all the other devices of the original
destination.
44.3.2 ANYCAST RP v6 Configuration Task
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Table of Contents
Troubleshooting
