Troubleshooting Pim-Sm; Monitoring The Multicast Routing Table - HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual

Configuring Multicast Support with PIM-SM

Troubleshooting PIM-SM

11-48
Troubleshooting PIM-SM
When hosts are not receiving multicasts, you must determine where the traffic
is going astray. Because PIM-SM relies on unidirectional trees, you should first
troubleshoot the router that directly connects to the hosts, then proceed to
the next hop upstream router until you find the point at which the traffic is
disrupted.

Monitoring the Multicast Routing Table

Having a solid understanding of the information that a multicast routing table
can provide will help you to troubleshoot PIM-SM functions. When you
understand how to read the table, you can view it to discover such things as:
for which multicast groups the router has received PIM or IGMP joins
through which interfaces the router receives and forwards specific types
of multicast traffic
the IP addresses of upstream RP and SP neighbors for specific groups
whether the router has joined an SP tree for a group
whether the router is acting as the DR for a source
how long specific entries have been active and when they will expire
If you need to review any of these concepts, see the "Overview" on page 11-3.
Use this enable mode command to view the multicast routing table:
ProCurve# show ip mroute