HP 7102dl - ProCurve Secure Router Configuration Manual page 636

Configuring Multicast Support for a Stub Network
Troubleshooting Multicast Stub Routing and IGMP
12-24
• The downstream interface is running a version of IGMP incompatible
with that used on the network. Enter show ip igmp interface and
view the IGMP version. You can change the version for a particular
interface by entering this command from the logical interface config-
uration mode context:
Syntax: ip igmp version [1 | 2]
For example:
ProCurve(config-eth 0/1)# ip igmp version 1
• The downstream interface is not waiting long enough for reports from
hosts. Try returning IGMP query intervals to their defaults. (See
"Altering IGMP Query Intervals" on page 12-19 for a discussion of
these intervals.)
• The host that you believe should be receiving messages has not
actually joined the correct multicast group. In this case, you would
need to troubleshoot the host.
4. If the correct group membership exists, then the router should know to
forward multicast messages into the host's network. You should verify
that the router is receiving the multicast messages. View the status of the
upstream interface with the show interfaces command and check that
it is receiving multicast packets.
5. If the router is not receiving messages, you may have a problem with IGMP
proxy. Hosts in a stub network can only receive multicasts from remote
networks if the stub router runs IGMP proxy. IGMP proxy problems
include:
• The downstream interface is not running IGMP proxy. Enter show ip
igmp interface and look for the helper address. (See Figure 12-7.)
• If the helper address is "disabled," move to the configuration mode
context for the interface and enter:
ProCurve(config-eth 0/1)# ip mcast-stub helper-enable
If you have not done so, you must also configure the helper address
from the global configuration mode context:
ProCurve(config)# ip mcast-stub helper-address 10.10.10.1