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Page 101 | AlliedWare™ OS How To Note: IGMP
Statically specifying that a port is a router port > Example
Statically specifying that a port is a router port
Since software versions 28
1
-04 and 29
1
-0
4
, you can statically configure particular ports as
multicast router ports. This feature is useful in some unusual network configurations in which
the learning process cannot identify all router ports. You could also use it creatively in special
circumstances, when a Querier is unnecessary.
To specify router ports, use the command:
add igmpsnooping vlan={vlan-name|1..4094}
routerport={port-list|all}
This command causes the switch to immediately forward all IGMP and multicast data packets
to the designated router port.
Note that this is an IGMP snooping command, designed to give administrators greater
control of layer 2 multicasting. It does not provide static multicast routing.
Example
The following sequence explores the effect of adding a static router port on a Rapier 48i
switch.
1. Enable IGMP debugging so you can see some of the mechanics behind the
commands.
2. Check the current IGMP snooping entries.
Note that there is one All Groups entry for port 50.
Manager Rapier 48i> enable ip igmp debug
Info (1005003): Operation successful.
Manager Rapier 48i> show igmpsnooping
IGMP Snooping
------------------------------------------------------------------------
Status ........................... Enabled
Disabled All-groups ports ........ None
Vlan Name (vlan id) ..... default (1)
Fast Leave .............. Off
Query Solicitation ...... On
Static Router Ports ..... None
Group List ..............
Group. 239.255.255.250 Entry timeout 190 secs
Ports 7
All Groups Entry timeout 255 secs
Ports 50
------------------------------------------------------------------------