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Stanislav Zaikin
Beginner

MSDP+MBGP rpf neighbor is null

Hello.

Couldn't get right RPF neighbor in pim topology:

RP/0/RSP0/CPU0:bgw0#sh pim multicast topology all  rpf
Mon Mar 16 12:04:59.319 UTC

Table: IPv4-Multicast-default
* *.*.1.215/32 [20/0]
    via Null with rpf neighbor 0.0.0.0
* *.*.1.216/32 [20/0]
    via Null with rpf neighbor 0.0.0.0

 

But there is valid rpf neighbor:

RP/0/RSP0/CPU0:bgw0#sh msdp sa-cache      
Mon Mar 16 12:11:08.381 UTC

MSDP Flags:
E - set MRIB E flag , L - domain local source is active,
EA - externally active source, PI - PIM is interested in the group,
DE - SAs have been denied.  Timers age/expiration,
Cache Entry:
(*.*.1.215, 226.100.11.1), RP *.*.118.65, MBGP/AS XXXXX, 00:25:15/00:02:29
  Learned from peer 10.200.2.2, RPF peer 10.200.2.2
  SAs recvd 28, Encapsulated data received: 0
    grp flags: PI,  src flags: E, EA, PI

And there is interesting output:

RP/0/RSP0/CPU0:bgw0#sh pim multicast topology all  rpf *.*.1.215
Mon Mar 16 12:05:01.670 UTC

Table: IPv4-Multicast-default
* *.*.1.215/32 [20/0]
    via Null with rpf neighbor 0.0.0.0
RP/0/RSP0/CPU0:bgw0#sh pim multicast topology all  rpf *.*.1.215 ?
  private  Internal RPF information(cisco-support)
  |        Output Modifiers
 
RP/0/RSP0/CPU0:bgw0#sh pim multicast topology all  rpf *.*.1.215 private
Mon Mar 16 12:05:04.601 UTC

Table: IPv4-Multicast-default
* *.*.1.215/32 [20/0]  RT_BGP
    via Null with rpf neighbor 0.0.0.0
      nbr: 10.200.2.2, rec_nbr: 10.200.2.2, r_nh: 10.200.2.2, idb: 0x50d20948 (0x0)
      tli: 0x50a4676c, mon: (0x508e92d4,0x508e92d4), safi: 0x0 (0x0,0x0)
      E_V: 0x0, D_I: 0x8000c20, Topo: (0,0,0,0,0,0x0,0x0), nht: 0xe0100000
      CT: 0, RD: 0:0, Un:0, MDT:1, Invalid: N srs:0
      I_R:0, VRF_RI:0,0x0000:0:0, S-AS:0

 

What could be a problem? BGP IPv4 Multicast RT has valid routes for source and RP. IOS XR version is 4.3.4.

1 REPLY 1
Stanislav Zaikin
Beginner

Solution was simple - turning off and on again multicast routing on interface.

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