Configuring Igmp Fast Leave Processing; Configuring Igmp Ssm Mapping; Configuration Prerequisites - HP 4800G Series Configuration Manual

To do...
Configure the other querier
present interval
If not statically configured, the startup query interval is 1/4 of the "IGMP query interval". By default,
the IGMP query interval is 60 seconds, so the startup query interval = 60 / 4 = 15 (seconds).
If not statically configured, the startup query count is set to the IGMP querier robustness variable.
By default, the IGMP querier robustness variable is 2, so the startup query count is also 2.
If not statically configured, the other querier present interval is [ IGMP query interval ] times [ IGMP
robustness variable ] plus [ maximum response time for IGMP general queries ] divided by two. The
default values of these three parameters are 60 (seconds), 2 and 10 (seconds) respectively, so the
other querier present interval = 60 × 2 + 10 / 2 = 125 (seconds).
If statically configured, the startup query interval, the startup query count, and the other querier
present interval take the configured values.
Make sure that the other querier present interval is greater than the IGMP query interval; otherwise
the IGMP querier may change frequently on the network.
Make sure that the IGMP query interval is greater than the maximum response time for IGMP
general queries; otherwise, multicast group members may be wrongly removed.
The configurations of the maximum response time for IGMP general queries, the IGMP last
member query interval and the IGMP other querier present interval are effective only for IGMPv2 or
IGMPv3.

Configuring IGMP Fast Leave Processing

IGMP fast leave processing is implemented by IGMP Snooping. For details, refer to IGMP Snooping
Configuration in the IP Multicast Volume.

Configuring IGMP SSM Mapping

Due to some possible restrictions, some receiver hosts on an SSM network may run IGMPv1 or
IGMPv2. To provide SSM service support for these receiver hosts, you need to configure the IGMP
mapping feature on the last hop router.

Configuration Prerequisites

Before configuring the IGMP SSM mapping feature, complete the following tasks:
Configure any unicast routing protocol so that all devices in the domain are interoperable at the
network layer.
Use the command...
igmp timer
other-querier-present interval
1-15
Remarks
Optional
For the system default, see
"Note" below.