IP Multicast Configuration
Configuring multicast client interfaces
Stinger®
IP2000 Configuration Guide
8-13
query-interval = 125
query-response-interval = 100
last-member-query-interval = 10
last-member-query-count = 2
Sample multicast video configuration with filters
In this sample setup, the MBONE interface is the Gigabit Ethernet port of the IP2000.
A multicast router on the local IP network sends video transmissions from a multicast
video server. In the sample configurations for the setup shown in Figure 8-5, two
types of filters are used:
■
mcast-service
profiles, to filter multicast groups and related services
■
filter
profiles, to filter out generic IP data
By introducing generic IP data filters, you can cause the system’s IP interfaces to
handle only multicast video services and block end users from accessing other
services in the network.
Parameter
Setting
robust-count
A threshold of packet losses (from 2 to 10) up to which
the multicast subsystem will remain robust. If the
interface is expected to have a high rate of packet loss,
increase this value. IGMP is robust to (
robust-count
minus 1) packet losses. It cannot be set to zero and
should not be set to 1. The default is 2.
query-interval
Number of seconds (from 0 to 1024) between general
queries. You can increase this value from its default of
125 seconds to reduce the number of IGMP queries
sent on the interface.
query-response-interval
Maximum response time in tenths of a second (from 0
to 1024) inserted into general queries. You can increase
this value from its default of 10 seconds to make IGMP
traffic less bursty, because host responses will be spread
out over a larger interval.
The number of seconds response time (this value
divided by 10) must be less than the
query-interval
value.
last-member-query-
interval
Maximum response time in tenths of a second (from 0
to 1024) inserted into group-specific queries sent in
response to Leave Group messages. You can reduce this
value from its default of 1 second to reduce the time it
takes to detect that the last member of a group has left.
The response time (this value divided by 10) must be
less than the
query-interval
value.
last-member-query-count
Number of group-specific queries sent before the
multicast router assumes there are no local members.
