Alcatel Carrier Internetworking Solutions 6648 Benutzerhandbuch

Troubleshooting Examples: Limitations

Troubleshooting PIM-SM

page 16-28

OmniSwitch Troubleshooting Guide

-> show ip pimsm
Status                     = enabled,
BSR Address                = 192.168.13.1,
BSR Expiry Time            = 00h:01m:43s,
CBSR Address               = 0.0.0.0,
CBSR Mask Length           = 30,
CBSR Priority              = 0,
CRP Address                = 192.168.12.2,
CRP Hold Time              = 150,
CRP Expiry Time            = 00h:05m:00s,
CRP Interval               = 60,
CRP Priority               = 0,
Data Timeout               = 210,
Join/Prune Interval        = 60,
Max RPs                    = 32,
Probe Time                 = 5,
Register Checksum          = header,
Register Suppress Timeout  = 60

-> show ip pimsm rp-candidate 

Group Address      RP Address      Status
------------------+---------------+--------
227.1.1.1/32       192.168.12.2    enabled
226.1.1.1/32       192.168.12.2    enabled

Only one C-RP should be configured per PIM domain. Having multiple C-RPs is not currently supported.

The problem with fragmentation and reassembly of PIM-SM tunneled packets (PIM register-encapsulated 
packets fall into this category), is if packets need to be fragmented, it might prevent mcast stream to be 
delivered properly. A smaller MTU size would work around this issue.

Use following debug commands to find an upstream neighbor or to verify next hop.

 -> debug ip pimsm rpf 172.100.1.254    
Source IP Address         = 172.100.1.254,
RPF Vlan                  = 100,
RPF Neighbor              = 172.100.1.254,
RPF Route/Mask            = 172.100.1.0/24,
RPF Metric Preference     = 1,
RPF Metric                = 0

-> debug ip pimsm rp-hash 224.0.0.0

Group Address      RP Address
------------------+------------------
224.0.0.0          172.100.1.254