3com S7906E 설치 설명서

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2)  Check the multicast filter configuration. Use the display current-configuration command to 

check the multicast filter configuration. Change the ACL rule defined in the source-policy 

command so that the source/group address of the multicast data can pass ACL filtering. 

An RPT cannot be established correctly, or the RPs cannot join the SPT to the multicast source. 

z 

As the core of a PIM-SM domain, the RPs serve specific multicast groups. Multiple RPs can coexist 

in a network. Make sure that the RP information on all routers is exactly the same, and a specific 

group is mapped to the same RP. Otherwise, multicast forwarding will fail. 

z 

If the static RP mechanism is used, the same static RP command must be executed on all the 

routers in the entire network. Otherwise, multicast forwarding will fail. 

1)  Check that a route is available to the RP. Carry out the display ip routing-table command to 

check whether a route is available on each router to the RP. 

2)  Check the dynamic RP information. Use the display pim rp-info command to check whether the 

RP information is consistent on all routers. 

3) Check 

the 

configuration 

of static RPs. Use the display pim rp-info command to check whether the 

same static RP address has been configured on all the routers in the entire network. 

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

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

established correctly, or the DR cannot perform source register with the RP. 

z 

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

route to the BSR, the BSR cannot receive C-RP-Adv messages from that C-RP and the bootstrap 

message of the BSR will not contain the information of that C-RP.  

z 

In addition, if the BSR does not have a unicast router to a C-RP, it will discard the C-RP-Adv 

messages from that C-RP, and therefore the bootstrap messages of the BSR will not contain the 

information of that C-RP. 

z 

The RP is the core of a PIM-SM domain. Make sure that the RP information on all routers is exactly 

the same, a specific group G is mapped to the same RP, and unicast routes are available to the 

RP. 

1)  Check whether routes to C-RPs and the BSR are available. Carry out the display ip routing-table 

command to check whether routes are available on each router to the RP and the BSR, and 

whether a route is available between the RP and the BSR. Make sure that each C-RP has a unicast