Igmp Overview - Extreme Networks ExtremeWare 7.2e Installation And User Manual

IGMP Overview

configure pim crp static <rp address> [none | <access profile>] {<priority [0-254]>}
The contains a list of multicast group accesses served by the RP.
access profile
For example, the following command statically configures an RP and its associated groups defined in
access profile rp-list:
configure pim crp static 10.0.3.1 rp-list
To configure the candidate RP advertising interval for PIM-SM timers, enter this command:
configure pim timer <hello interval> <join prune interval> vlan [<vlan name>]
Specify the intervals in seconds. The specifies the amount of time before a hello
hello interval
message is sent out by the PIM router. The interval is the amount of time before a join or a
join prune
prune command is executed. The valid range for both intervals is 1 to 65,519 seconds. The default for
the is 30 seconds; the default for is 60 seconds.
hello interval join prune
Because PIM leverages the unicast routing capability that is already present in the switch, the access
policy capabilities are, by nature, different. When the PIM protocol is used for routing IP multicast
traffic, the switch can be configured to use an access profile to determine trusted PIM router neighbors
for the VLAN on the switch running PIM. To configure a trusted neighbor policy enter the following
command:
configure pim vlan [<vlan name> | all] trusted-gateway [<access profile> | none]
For example, the following command configures a trusted neighbor policy on the VLAN backbone:
configure pim vlan backbone trusted-gateway
To configure the threshold (in Kbps) for switching to SPT, enter the following command:
configure pim spt-threshold <last hop router threshold> {<rp threshold>}
On leaf routers, this setting is based on data packets. On the RP, this setting is based on register packet
rate in Kbps.
The following command configures the checksum computation to either include data (for compatibility
with Cisco Systems products) or to exclude data (for RFC-compliant operation), in the register message:
configure pim register-checksum-to [include-data | exclude-data]
IGMP Overview
IGMP is a protocol used by an IP host to register its IP multicast group membership with a router.
Periodically, the router queries the multicast group to see if the group is still in use. If the group is still
active, a single IP host responds to the query, and group registration is maintained.
IGMP is enabled by default on the switch. However, the switch can be configured to disable the
generation of periodic IGMP query packets. IGMP should be enabled when the switch is configured to
perform IP unicast or IP multicast routing.
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