HP VPN Firewall Appliances Network Management Configuration Guide

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[Firewall-GigabitEthernet0/1] quit
[Firewall] interface gigabitethernet 0/2
[Firewall-GigabitEthernet0/2] igmp enable
[Firewall-GigabitEthernet0/2] quit
c. Verifying the configuration
# Display IGMP information on GigabitEthernet 0/1 of the firewall.
[Firewall] display igmp interface gigabitethernet 0/1 verbose
GigabitEthernet0/1(192.168.1.2):
IGMP proxy is enabled
Current IGMP version is 2
Multicast routing on this interface: enabled
Require-router-alert: disabled
Version1-querier-present-timer-expiry: 00:00:20
# Display IGMP group information on Router A.
[RouterA] display igmp group
Total 1 IGMP Group(s).
Interface group report information of VPN-Instance: public net
Ethernet1/1(192.168.1.1):
Total 1 IGMP Groups reported
Group Address Last Reporter Uptime Expires
224.1.1.1 192.168.1.2 00:02:04 00:01:15
The output shows that IGMP reports from the hosts are forwarded to Router A through the proxy
interface, GigabitEthernet 0/1 of the firewall.
Troubleshooting IGMP
This section describes common IGMP problems and how to troubleshoot them.
No membership information exists on the receiver-side router
Symptom
When a host sends a report for joining multicast group G, no membership information of the multicast
group G exists on the router closest to that host.
Analysis
• The correctness of networking and interface connections and whether the protocol layer of the
interface is up directly affect the generation of group membership information.
• Multicast routing must be enabled on the router, and IGMP must be enabled on the interface that
connects to the host.
• If the IGMP version on the router interface is lower than that on the host, the router will not be able
to recognize the IGMP report from the host.
• If you have configured the igmp group-policy command on the interface, the interface cannot
receive report messages that fail to pass filtering.