24-Port Layer 3 Switch Management Guide

ONFIGURING

THE

WITCH

3-218

Web - Click Routing Protocol, OSPF, Neighbor Information.

CLI - This shows a designated router and backup designated router as

neighbors.

Multicast Routing

This router can route multicast traffic to different subnetworks using

either Distance Vector Multicast Routing Protocol (DVMRP) or

Protocol-Independent Multicasting - Dense Mode (PIM-DM). These

protocols flood multicast traffic downstream, and calculate the

shortest-path, source-rooted delivery tree between each source and

destination host group. They also rely on messages sent from

IGMP-enabled Layer 2 switches and hosts to determine when hosts want

to join or leave multicast groups.

DVMRP builds a source-rooted multicast delivery tree that allows it to

prevent looping and determine the shortest path to the source of the

multicast traffic. PIM also builds a source-rooted multicast delivery tree for

each multicast source, but uses information from the router’s unicast

routing table instead of maintaining its own multicast routing table, making

Console#show ip ospf neighbor 4-282

ID Pri State Address

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

10.2.44.5 1 FULL/DR 10.2.44.88

10.2.44.6 2 FULL/BDR 10.2.44.88

Console#