HP 7102dl - ProCurve Secure Router Configuration Manual page 634

Configuring Multicast Support for a Stub Network
Troubleshooting Multicast Stub Routing and IGMP
N o t e
View Command Syntax
group memberships show ip igmp groups
stored on the router
multicast routing table show ip mroute
IGMP interfaces show ip igmp
interface
real-time IGMP debug ip igmp
messages
real-time IGMP debug ip igmp
messages for a <A.B.C.D>
specific group
12-22
When troubleshooting multicast stub routing, you should follow the general
procedure described below. You will use the show and debug commands
summarized in Table 12-2.
You enter show and debug commands from the enable mode context. You
can also add do to the commands to enter them from any configuration mode
context.
Table 12-2. Multicast and IGMP Troubleshooting Commands
Displays
• multicast address
• connecting (downstream)
interface
• uptime and expiration time
• host that last reported on the
group
for each route:
• uptime and expiration time
• incoming interface
• list of outgoing interfaces
for each downstream interface:
• IP address
• whether IGMP is enabled
• IGMP version number
• IGMP intervals
• helper address
• IGMP reports from hosts
• IGMP queries
• IGMP reports from hosts
• IGMP queries
Function
verify that the router knows that a
group exists on a network
verify that:
• the router can forward
multicasts
• the router will forward
multicasts out the correct
downstream interfaces
• verify that the interface can run
IGMP in the version used on the
network
• check for problems with IGMP
intervals
• view the helper address
verify that the router is receiving
IGMP messages
verify that the router is receiving
IGMP messages for a specific
group