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Alcatel Carrier Internetworking Solutions 6648 User Manual

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Join/Prune
Troubleshooting PIM-SM
page 16-20
OmniSwitch Troubleshooting Guide
September 2005
      PIM:               .... ..1. = WC bit - join / prune applies to the (*,G) or (*,*,RP) entry
      PIM:               .... ...1 = RPT-bit - information about (S,G) is sent towards the RP
      PIM: Mask length    = 32
      PIM: Source address = [192.168.11.2]
Simplified PRUNE Packet
The main difference between a JOIN and PRUNE is the number of joined source versus pruned source:
PIM: *** Encoded-Multicast Group Address-1 ***
      PIM: Address family           = 1 (IP (IP version 4))
      PIM: Encoding type            = 0
      PIM: Reserved                 = 0
      PIM: Mask length              = 32
      PIM: Group multicast address  = [225.1.1.1]
      PIM: Number of joined sources = 0
      PIM: Number of pruned sources = 1
Debugging JOIN/PRUNE Event
The commands below will allow you to see any JOIN/PRUNE message:
-> ip pimsm debug-type joinprune 
-> ip pimsm debug-level 100    
That will show if the message is join or prune, the upstream router, outgoing VLAN, the multicast group 
and the RP.
tPimsm-:        BuildJoinPrune: for nbr:192.168.12.1 on vlan:2
tPimsm-:        BuildJoinPrune: next route
tPimsm-:        Sending Triggered GJoins Joins 1 Prunes 0
tPimsm-:        BuildJoinPrune: for nbr:192.168.12.1 on vlan:2
tPimsm-:        BuildJoinPrune: next route
tPimsm-:        BuildJoinPrune: (*,225.1.1.1) route
tPimsm-:        BuildJoinPrune: next route
tPimsm-:        Send Join (192.168.11.2,225.1.1.1) on vlan 2,bits:7 holdtime 210
tPimsm-:        BuildJoinPrune: for nbr:192.168.12.1 on vlan:2
tPimsm-:        BuildJoinPrune: next route
tPimsm-:        BuildJoinPrune: (*,225.1.1.1) route
tPimsm-:        BuildJoinPrune: next route
tPimsm-:        Send Join (192.168.11.2,225.1.1.1) on vlan 2,bits:7 holdtime 210