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Source DR Does Not Send Register Messages to the RP After Receiving Multicast Data Packets
Fault Description
After multicast configuration is complete on a network, a multicast source sends multicast data. However, the rendezvous point (RP) does not generate any multicast routing entry, and the source designated router (DR) does not send any Register message to the RP.
Procedure
- Run the display pim routing-table group-address command on the source DR to check whether the source DR considers itself as a source DR.
Only a source DR can send Register messages to the RP. The following information shows that the source DR considers itself as a source DR.
<Huawei> display pim routing-table 225.0.0.1 VPN-Instance: public net Total 0 (*, G) entry; 1 (S, G) entry (172.16.0.12, 225.0.0.1) RP: 10.2.2.2 Protocol: pim-sm, Flag: SPT LOC ACT UpTime: 02:54:43 Upstream interface: GigabitEthernet1/0/0 Upstream neighbor: NULL RPF prime neighbor: NULL Downstream interface(s) information: Total number of downstreams: 1 1: GigabitEthernet2/0/0 Protocol: pim-sm, UpTime: 02:54:43, Expires: 00:02:47
- If the LOC flag is not displayed, the device does not consider itself as a source DR. Run the display rm interface interface-type interface-number command to check whether the peer address of the upstream interface is the multicast source address.
In this example, the upstream interface is GE1/0/0. Run the following command to check the peer address of GE1/0/0:
<Huawei> display rm interface gigabitethernet 1/0/0 Name: GigabitEthernet1/0/0 Physical IF Info: IfnetIndex: 0x6 State: DOWN P2P MULT Hardware Address: 286E-D4D4-4F54 Slot: 0(Logic Slot: 0) IntType: 3, PriLog: 0, MTU: 1500, Reference Count 1 Bandwidth: 0, 64000 Baudrate: 0, 64000 Delay: 0, Reliability: 0, Load: 0 LDP-ISIS sync capability: disabled LDP-OSPF sync capability: disabled InstanceID: 0, Instance Name: Public Age: 1236sec Logical IF Info: IfnetIndex: 0x3E, PhyIndex: 21 Logical Index : 3, Dest: 172.16.0.12, Mask: 255.255.255.0 State: UP PRM BCA MULT , Reference Count 3 Age: 1623973sec
- If the multicast source address is not the peer address, change the multicast source address to the peer address. Then the source DR can complete registration successfully.