Planet XGS3-24042 User Manual download pdf (Page 416)

100

101

48-15

In configuring and using PIM-SM Protocol, PIM-SM Protocol might not operate normally caused by physical

connection or incorrect configuration. Therefore, the user should pay attention to the following issues:

 Assure that physical connection is correct;

 Assure the Protocol of Interface and Link is UP (use show interface command);

 Assure that PIM Protocol is enabled in Global Mode (use ip pim multicast-routing);

 Assure that PIM-SM is configured on the interface (use ip pim sparse-mode);

 Multicast Protocol requires RPF Check using unicast routing; therefore the correctness of unicast

routing must be assured beforehand;

 PIM-SM Protocol requires supports by RP and BSR, therefore you should use show ip pim bsr-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 ip pim rp-hash command to check if RP information is correct; if there is not RP information,

you still need to check unicast routing.

If all attempts including Check are made but the problems on PIM-SM can’t be solved yet, then use debug

commands such debug pim/debug pim BSR please, and then copy DEBUG information in 3 minutes and

send to Technology Service Center.

48.4 MSDP Configuration

48.4.1 Introduction to MSDP

MSDP – Multicast Source Discovery Protocol, is a protocol that can learn information about multicast source

in other PIM-SM domain. The RP on which MSDP is configured will advertise the information about the

multicast sources in its domain to all the other MSDP entities through SA messages. Thus, all the information

about multicast sources in one PIM-SM domain is spread to another. In MSDP, inter-domain information tree

is used other than the shared tree. It is required that the multicast routing protocol used for in-domain routing

must be PIM-SM.

 The work flow for RP in PIM-SM protocol

Multicast

Application Server

1 PIM Register

Packet

4 Switching to the

shortest path tree

and do the delivery

2 The subscriber

join the group

3 The

multicast

date is

deliveried

through the

shared tree

Subscriber

1 2 ... 411 412 413 414 415 416 417 418 419 420 421 ... 720 721

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