Switch Management and Operating Concepts
You can configure the switch to snoop and to keep track of IGMP groups. These two interact in the following ways:
•If the IP interface has IGMP Snooping configured for the associated VLAN, the configuration of IGMP Snooping will be overwritten by the IGMP group settings. On such VLANs, the per- VLAN flag is the only available configurable option on the IGMP Snooping screen.
•If the IGMP group settings are disabled on the interface, IGMP Snooping on the VLAN becomes configurable and the switch uses these settings for the VLAN.
Note: The switch supports a maximum of 255 VLANs and a maximum of 128 IGMP Snooping groups. If you create more than 128 VLANs with IGMP Snooping enabled, some of those VLANs will not be added to the IGMP Snooping table and the group’s data will be flooded in the VLAN.
IGMP Group Settings
An IP host uses IGMP to register its IP multicast group membership with the switch. Periodically, the switch queries the multicast group to see if the group is still in use and takes one of the following actions:
•If the group is still active, a single IP host responds to the query, and the group registration is maintained.
•If the group is inactive and a report is not received within the time limit for a response, the group registration is removed.
Routing Protocols
This section presents an overview of routing protocols that the switch supports.
RIP
The Routing Information Protocol (RIP) is a
•Enable or disable RIP on the switch
•Enable or disable transmitting RIP packets on a specific IP interface
•Enable or disable receiving RIP packets on a specific IP interface
Distance Vector Multicast Routing Protocol (DVMRP)
The Distance Vector Multicast Routing Protocol (DVMRP) is a
The switch supports DVMRP v3.
38 | ZT8101 User’s Manual |