Manual

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Москва, Новозаводская ул., 18, стр. 1

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Switch(router-msdp)#mesh-group QTECH -1

28.4.8 MSDP Troubleshooting

When MSDP is being configured, it may not function because of the physical link not working

or configuration mistakes. Attention should be paid to the following items in order to make

MSDP work:

Make sure the physical link works well

Make sure inner-domain and inter-domain routing works

Make sure PIM-SM is applied in every domain as the inner-domain routing protocol, and

configuration for PIM-SM works well

Make sure MSDP is enabled, and the link status of the MSDP enabled Peer is UP

Use the command show msdp global to check whether the MSDP configuration is correct

If the MSDP problems cannot be solved through all the methods provided above, please issue

the command debug msdp to get the debugging messages within three minutes, and send

them to the technical service center of our company.

28.5 ANYCAST RP Configuration

28.5.1 Introduction to ANYCAST RP

Anycast RP is a technology based on PIM protocol, which provides redundancy in order to

recover as soon as possible once an RP becomes unusable.

The kernel concept of Anycast RP is that the RP addresses configured all over the whole

network exist on multiple multicast servers (the most common situation is that every device

providing ANYCAST RP uses LOOPBACK interface, 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 algorithm will

ensure that the PIM 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 ANYCAST

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