3Com Switch 8800 Advanced Software V5 Configuration Guide

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576 CHAPTER 42: PIM CONFIGURATION

■ TTL value of state refresh messages

■ Graft retry period

Enabling PIM-DM With PIM-DM enabled, a device sends hello messages periodically to discover PIM

neighbors and processes messages from PIM neighbors. When deploying a

PIM-DM domain, you are recommended to enable PIM-DM on all interfaces of

non-border devices (border devices are PIM-enabled routers or PIM-enabled

switches located on the boundary of BSR admin-scope regions).

Follow these steps to enable PIM-DM:

CAUTION:

■ All the interfaces of the same router must work in the same PIM mode.

■ After PIM-DM is enabled on a VLAN interface, IGMP snooping cannot be

enabled in the VLAN corresponding to the VLAN interface, and vice versa.

Enabling State Refresh An interface without the state refresh capability cannot forward state refresh

messages.

Follow these steps to enable the state refresh capability:

Configuring State

Refresh Parameters

To avoid the resource-consuming reflooding of unwanted traffic caused by

timeout of pruned interfaces, the device directly connected with the multicast

source periodically sends an (S, G) state refresh message, which is forwarded hop

by hop along the initial multicast flooding path of the PIM-DM domain, to refresh

the prune timer state of all the devices on the path.

A device may receive multiple state refresh messages within a short time, of which

some may be duplicated messages. To keep a device from receiving such

duplicated messages, you can configure the time the device must wait before

receiving the next state refresh message. If a new state refresh message is received

within the waiting time, the device will discard it; if this timer times out, the device

To do... Use the command... Remarks

Enter system view system-view -

Enable IP multicast routing multicast routing-enable Required

Disable by default

Enter VLAN/POS interface

view

interface interface-type

interface-number

Enable PIM-DM pim dm Required

Disabled by default