SMC Networks SMC6724L3 manual Configuring PIM-DM, 231

MULTICAST ROUTING

•Up time – The time elapsed since this entry was created.

•Expire – The time remaining before this entry will be aged out.

Web – Click Routing Protocol, DVMRP, DVMRP Routing Table.

CLI – This example displays known DVMRP routes.

Console#show ip	dvmrp route					4-299
Source	Mask	Upstream_nbr	Interface Metric UpTime Expire
---------------	--------------- --------------- --------- ------ ------ ------
10.1.0.0	255.255.255.0	10.1.0.253	vlan1	1	84438	0
10.1.1.0	255.255.255.0	10.1.1.253	vlan2	1	84987	0
10.1.8.0	255.255.255.0	10.1.0.254	vlan1	2	19729	97
Console#

Configuring PIM-DM

Protocol-Independent Multicasting (PIM) provides two different modes of operation: sparse mode and dense mode. Sparse mode (SM) is designed for networks where the probability of multicast group members is low, such as the Internet. Dense mode (DM), on the other hand, is designed for networks where the probability of multicast group members is high, such as a local network.

PIM-DM is a simple multicast routing protocol that uses flood and prune to build a source-routed multicast delivery tree for each multicast source-group pair. It is simpler than DVMRP because it does not maintain it’s own routing table. Instead, it uses the routing table provided by the unicast routing protocol enabled on the router interface. When the router receives a multicast packet for a source-group pair, PIM-DM checks the unicast routing table on the inbound interface to determine if this is the same interface used for routing unicast packets to the multicast source

3-231