Mrinfo display multicast metric = 0

[david de sousa]

Hi guys,

i'm troubleshooting multicast issue, so i used some cli Tools to debug.

for now, i used mstat to see what about the path, and i found that there is 100% loss on a router.

so i used the mrinfo command to see if there is a problem with Neighbors and my output show the metric = 0

10.1.1.3 (xxx) [version  12.2] [flags: PMSA]:
  10.64.2.178 -> 10.64.2.177 (xxx) [0/0/pim/querier]
  10.64.2.49 -> 10.64.2.50 (xxx) [0/0/pim]
  10.64.2.186 -> 0.0.0.0 [0/0/pim/down/leaf]
 

anyone can say what can cause that output ? is it a problem ? or just a bad output ? because the next router give an output of mrinfo correct with metric at 1.

thanks for reply.

Regards.

[dominic.caron]

The output look ok. Looks like you remove the ttl-threshold on the some router.

Can you describe the problem and  your network topologie?

[david de sousa]

HI,

you mean with spt-threshold infinity ?

cause, yes, we did it to avoid duplicate packet, but all my routers are in this state, but for others, i see the mrinfo with a metric =1. that's why i asked myself about this difference.

the problem is : i did mstat to trace the path and see if there are problem, i did a mstat between a sender and a receiver, and the same sender to another receiver who's located on another place, so use another link. and it's always this router who show a packet loss of 100%

here is an example :

 Source        Response Dest   Packet Statistics For     Only For Traffic
10.107.6.72     10.64.2.50      All Multicast Traffic     From 10.107.6.72
     |       __/  rtt 16   ms   Lost/Sent = Pct  Rate     To 234.34.34.100
     v      /     hop 249  s    ---------------------     --------------------
10.107.6.1
10.64.10.101    ?
     |     ^      ttl   0
     v     |      hop 0    ms    11030/11030 = 100%      1103 pps    0/0 = --%  0 pps
10.64.10.102
10.0.2.2        ?
     |      \__   ttl   1
     v         \  hop -249 s         0         0 pps           0    0 pps
10.0.2.194      10.64.2.50
  Receiver      Query Source
 

even if i make the mstat to another listener, it's always the link connected to the router (my first question with the mrinfo). that's why i asked myself about a problem on that router.

BUT, the multicast passes, i loose packets sometimes but it's not a 100% loss

i will make a draw of the topology...