HP VPN Firewall Appliances Network Management Configuration Guide

587
Ste
p
Command Remarks
8. Configure the IGMP last
member query interval.
igmp
last-member-query-interval
interval
1 second by default.
9. Configure the other
querier present interval.
igmp timer
other-querier-present interval
By default, the other querier present interval
is [ IGMP general query interval ] × [ IGMP
robustness variable ] + [ maximum response
time for IGMP general queries ] / 2.
Enabling IGMP fast-leave processing
In some applications, such as ADSL dial-up networking, only one multicast receiver host is attached to a
port of the IGMP querier. To allow fast response to the leave messages of the host when it switches
frequently from one multicast group to another, you can enable IGMP fast-leave processing on the IGMP
querier.
With fast-leave processing enabled, after receiving an IGMP leave message from a host, the IGMP
querier directly sends a leave notification to the upstream without sending IGMP group-specific queries
or IGMP group-and-source-specific queries. Thus, the leave latency is reduced on one hand, and the
network bandwidth is saved on the other hand.
The IGMP fast-leave processing configuration is effective only if the device is running IGMPv2 or
IGMPv3.
To enable IGMP fast-leave processing globally:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter public network IGMP view.
igmp N/A
3. Enable IGMP fast-leave processing.
fast-leave [ group-policy acl-number ] Disabled by default.
To enable IGMP fast-leave processing on an interface:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type interface-number N/A
3. Enable IGMP fast-leave
processing.
igmp fast-leave [ group-policy acl-number ] Disabled by default.
Enabling the IGMP host tracking function
When the IGMP host tracking function is enabled, the router can record the information of the member
hosts that are receiving multicast traffic, including the host IP address, running duration, and timeout time.
You can monitor and manage the member hosts according to the recorded information.
To enable the IGMP host tracking function globally:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter public network IGMP view.
igmp N/A