HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual page 523

3. If the interface in question does not have the group membership, the
router will not forward the multicasts into the network. The lack of the
entry could stem from several sources:
• The Ethernet (or WAN) interface connecting to the network has not
been configured as a downstream interface, so it is not listening for
IGMP messages. Enter the following command to view the interfaces
configured as IGMP interfaces:
ProCurve# show ip igmp interface
Figure 10-7 illustrates an example of the output from this command.
ProCurve# show ip igmp interface
eth 0/1 is UP
Ip Address is 10.22.120.47, netmask is 255.255.255.0
IGMP is enabled on interface
Current IGMP version is 2
IGMP query interval is 60 seconds
IGMP querier timeout is 120 seconds
IGMP max query response time is 10 seconds
Last member query count is 2
Last member query response interval is 1000 ms
IGMP activity: 548 joins, 0 leaves
IGMP querying router is 0.0.0.0
IGMP helper address is disabled
Figure 10-7. Viewing IGMP Interfaces
• 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 10-16 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.
Configuring Multicast Support for a Stub Network
Troubleshooting Multicast Stub Routing and IGMP
IGMP version
Interface is not running
IGMP proxy or is an
upstream interface
10-21