Manageable
IGMP Snooping & IP Multicast Filtering Continued...
If there is more than one router on the LAN performing IP multicasting, one of the routers is elected ‘querier’ and assumes the reponsibility.
Based on the group membership information learned from the IGMP, a router can determine which (if any) multicast traffic needs to be forwarded to each of its ‘leaf’
Routing switches support IP Multicast Filtering by:
-Passively snooping on the IGMP Query and IGMP Report packets transferred between IP Multicast Routers and IP Multicast host groups to learn about IP Multicast group members, and
-Actively sending IGMP Query messages to solicit IP Multicast group members.
The purpose of IP multicast filtering is to optimize a switched network’s performance, so multicast packets will only be forwarded to those ports containing multicast group hosts members and routers instead of flooding to all ports in the subnet (VLAN).
Routing switches with IP multicast filtering/switching capability not only run passively monitor IGMP Query and Report messages, DVMRP Probe messages, PIM, and MOSPF Hello messages; they also actively send IGMP Query messages to learn locations of multicast routers and member hosts in multicast groups within each VLAN.
Note, however, IGMP neither alters nor routes any IP multicast packets. Since IGMP is not concerned with the delivery of IP multicast packets across
SWITCH MANAGEMENT
Administration Console Via RS-232 Console Port:
The switch provides an on board serial port, which allows the switch to be configured via a directly connected terminal or a Telnet session.
Web-Based Browser Interface:
The switch also boasts a
External SNMP-Based Network Management:
The switch can also be configured via SNMP.
For more information on switch management, please refer to the "Switch Management" section.
User’s Manual | 11 |
