KB.15.15

Example 28 PIM neighbor output

This example simulates output from routing switch “#1” in Figure 8 (page 44). The data identifies

the first downstream neighbor (“routing switch #2”.)

HP Switch(config)# show ip pim neighbor

PIM Neighbors

IP Address VLAN Up Time (sec) Expire Time (sec)

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

10.29.30.2 29 196 89

Syntax:

show ip pim [neighbor [ ip-address ]]

Lists the same information as the show ip pim neighbor

Example 29 Showing a specific neighbor

This example simulates output from routing switch “#1” in Figure 8 (page 44). The

data is from the first downstream neighbor (routing switch “#2”.)

HP Switch(config)# show ip pim neighbor 10.29.30.2

PIM Neighbor

IP Address : 10.29.30.2

VLAN : 29

Up Time (sec) : 26

Expire Time (sec) : 79

About PIM-DM

In a network where IP multicast traffic is transmitted for multimedia applications, traffic is blocked

at routed interface (VLAN) boundaries unless a multicast routing protocol is running. PIM is a family

of routing protocols that form multicast trees to forward traffic from multicast sources to subnets are

using a protocol such as IGMP to request the traffic. PIM relies on the unicast routing tables created

by any of several unicast routing protocols to identify the path back to a multicast source, known

as reverse path forwarding (RPF.) Based on information provided by the unicast routing tables,

PIM sets up a distribution tree for the multicast traffic. The PIM-DM and PIM-SM protocols on the

switches enable and control multicast traffic routing.

IGMP provides the multicast traffic link between a host and a multicast router running PIM-DM or

PIM-SM. IGMP and either PIM-DM or PIM-SM must be enabled on VLANs whose member ports

have directly connected hosts with a valid need to join multicast groups. PIM-DM is used in networks

where, at any given time, multicast group members exist in relatively large numbers and are present

in most subnets.

License requirements:

In the 3500yl, 5400zl, and 6600 and 8200zl switches, PIM-DM is included with the Premium

License. In the 6200yl switches, this feature is included with the base feature set.

PIM-DM features

PIM-DM features on switches covered by this guide include:

Routing protocol support PIM uses whichever unicast routing protocol

is running on the routing switch. These can

include:

• RIP

• OSPF

About PIM-DM 55