Cuda 12000 IP Access Switch CLI-based Administration Guide
Managing IGMP Interfaces 357
Configuring IGMP Interface Parameters
You can configure the following IGMP interface parameters:
■Query Interval — Specifies the frequency, in seconds, that the Cuda
12000 transmits IGMP host query packets on this particular interface. The
default is 125 seconds with a range of 10 to 65535 seconds.
■Query Max Response Time — Specifies the maximum number of
seconds that the Cuda 12000 waits for a response to an IGMP Query
message before deleting the group. The default is 10 seconds with a
range of 1 to 25 seconds.
■Versi on — Version of IGMP running on this particular interface. For IGMP
to function properly, all routers on a network must be configured to run
the same version of IGMP. The default is 2 and the possible values are:
■2 – Version 2. If the Cuda 12000 encounters another host or router on
the network using Version 1, the Cuda 12000 reverts back to using
Version 1.
■1 – Version 1.
■v2_only – Version 2 only. If the Cuda 12000 encounters another host
or router on the network using Version 1, the Cuda 12000 continues
to run Version 2.
■Robustness — Allows you to compensate for the expected packet loss
on a subnet. Increase the value if you expect the loss to be high. The
default is 2 and the range is 1 to 255.
■Router — Enables the interface to function as an IGMP Querier (router).
For the DOCSIS module, the default is router. If multiple routers attempt
to become the IGMP Querier, the one with the lowest IP address becomes
the querier. When you change an interface from a querier to a host, any
multicast groups that are learned are removed. When you change the
interface from a host to a querier, or from a querier to a host, any
multicast groups joined locally or by an application running on the Cuda
12000 remain. Note that the DOCSIS module can only be configured as
an IGMP querier (router); all other interfaces default to IGMP hosts.
■Last Query Interval — Specifies the number of seconds between
queries to find other hosts on the network that want to receive traffic
from the multicast group. You can tune this parameter to modify the
leave latency of the network. A reduced value results in reduced time to
detect the loss of the last member of a group. The default is 1 and the
range is 1 to 25 seconds.