3Com 10014298 Setting the PIM-SM Domain Border, Configuring Candidate-BSRs, Pim bsr-boundary

Configuring PIM-SM 139

Repeat this configuration to enable PIM-SM on other interfaces. Only one multicast routing protocol can be enabled on an interface at a time.

Once enabled, PIM-DM cannot be enabled on the same interface.

Setting the PIM-SM Domain Border

After the PIM-SM domain border is configured, bootstrap messages cannot cross the border in any direction. In this way, the PIM-SM domain can be split.

Perform the following configuration in VLAN interface view.

Table 146 Setting the PIM-SM Domain Border

Operation	Command
Set the PIM-SM domain border	pim bsr-boundary
Remove the PIM-SM domain border	undo pim bsr-boundary
configured

By default, no domain border is set. After this configuration is performed, a bootstrap message cannot cross the border, but other PIM packets can. This configuration can effectively divide a network into domains using different BSRs.

This command cannot create a multicast packet forwarding border but only a PIM bootstrap message border.

Entering PIM View

Global parameters of PIM should be configured in PIM view.

Perform the following configuration in system view.

Table 147 Entering PIM View

Operation	Command
Enter PIM view	pim
Back to system view	undo pim

Using undo pim command, you can clear the configuration in PIM view and back to system view.

Configuring Candidate-BSRs

In a PIM domain, one or more candidate BSRs should be configured. A BSR (Bootstrap Router) is elected among candidate BSRs. The BSR takes charge of collecting and advertising RP information.

The automatic election among candidate BSRs is described as follows. One interface which has started PIM-SM must be specified when configuring the router as the candidate BSR. At first, each candidate BSR considers itself as the BSR of the PIM-SM domain, and sends a Bootstrap message by taking the IP address of the interface as the BSR address. When receiving Bootstrap messages from other routers, the candidate BSR will compare the BSR address of the newly received Bootstrap message with that of itself. Comparison standards include priority and IP address. The bigger IP address is considered better when the priority is the same. If the new BSR address is better, the candidate BSR will replace its BSR address.