Allied Telesis at-8700xl series switch manual Routing Information Protocol RIP, IGMP Snooping

70AT-8700XL Series Switch User Guide

Routing Information Protocol (RIP)

Routing protocols such as RIPv1 and RIPv2 can be enabled on a VLAN. For example, to enable RIPv2 on the admin VLAN, use the command:

ADD IP RIP INTERFACE=vlan11 SEND=RIP2 RECEIVE=BOTH

To display information about RIP (Figure on page 70), use the command:

SHOW IP RIP

Example output from the SHOW IP RIP command.

Interface Circuit/DLCI IP Address Send Receive Demand Auth Password

-------------------------------------------------------------------------------

vlan11	-	-	RIP2	BOTH	NO	NO
ppp0	-	172.16.249.34	RIP1	RIP2	YES	PASS ********

-------------------------------------------------------------------------------

IGMP Snooping

IGMP (Internet Group Management Protocol) is used by IP hosts to report their multicast group memberships to routers and switches. IP hosts join a multicast group to receive broadcast messages directed to the multicast group address. IGMP is an IP-based protocol and uses IP addresses to identify both the multicast groups and the host members. For a VLAN-aware devices, this means multicast group membership is on a per-VLAN basis. If at least one port in the VLAN is a member of a multicast group, by default multicast packets will be flooded onto all ports in the VLAN.

IGMP snooping enables the switch to forward multicast traffic intelligently on the switch. The switch listens to IGMP membership reports, queries and leave messages to identify the switch ports that are members of multicast groups.

Multicast traffic will only be forwarded to ports identified as members of the specific multicast group.

IGMP snooping is performed at Layer 2 on VLAN interfaces automatically. By default, the switch will only forward traffic out those ports with multicast listeners, therefore it will not act as a simple hub and flood all multicast traffic out all ports. IGMP snooping is independent of the IGMP and Layer 3 configuration, so an IP interface does not have to be attached to the VLAN, and IGMP does not have to be enabled or configured.

IGMP snooping is enabled by default. To disable it, use the command:

DISABLE IGMPSNOOPING

Software Release 2.6.1 C613-02030-00 REV B