4000 Router Series IP Multicast Configuration Guide

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Ste

Command Remarks

3. Return to system view.

quit N/A

4. Enter interface view.

interface interface-type

interface-number

N/A

5. Enable PIM-SM.

pim sm By default, PIM-SM is disabled.

Configuring an RP

An RP can provide services for multiple or all multicast groups. However, only one RP can forward

multicast traffic for a multicast group at a moment.

An RP can be manually configured or dynamically elected through the BSR mechanism. For a

large-scaled PIM network, configuring static RPs is a tedious job. Generally, static RPs are backups for

dynamic RPs to enhance the robustness and operational manageability on a multicast network.

Configuring a static RP

If only one dynamic RP exists on a network, you can configure a static RP to avoid communication

interruption caused by single-point failures. It can also avoid waste of bandwidth due to frequent

message exchange between C-RPs and the BSR. The static RP configuration must be the same on all

routers in the PIM-SM domain.

To configure a static RP:

Ste

Command

Remarks

1. Enter system view.

system-view

N/A

2. Enter PIM view.

pim [ vpn-instance

vpn-instance-name ]

N/A

3. Configure a static RP for

PIM-SM.

static-rp rp-address [ acl-number |

preferred ] *

By default, no static RP is

configured.

Configuring a C-RP

IMPORTANT:

hen you configure a C-RP, reserve a relatively large bandwidth between the C-RP and the other devices

in the PIM-SM domain.

In a PIM-SM domain, if you want a router to become the RP, you can configure the router as a C-RP. The

BSR collects the C-RP information according to the received advertisement messages from C-RPs or the

auto-RP announcements from other routers. Then, it organizes the C-RP information into the RP-set

information, which is flooded throughout the entire network. Then, the other routers in the network can

determine the RPs for different multicast group ranges based on the RP-set information. HP recommends

configuring C-RPs on backbone routers.

To enable the BSR to distribute the RP-set information in the PIM-SM domain, the C-RPs must periodically

send advertisement messages to the BSR. The BSR learns the C-RP information, encapsulates the C-RP

information and its own IP address in a BSM, and floods the BSM to all PIM routers in the domain.

An advertisement message contains a holdtime option, which defines the C-RP lifetime for the advertising

C-RP. After the BSR receives an advertisement message from a C-RP, it starts a timer for the C-RP. If the BSR