3Com 3031 Command Reference Manual page 709

3com 3031: reference guide

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are permitted as BSR, the router will not receive and forward other BSR

information and legal BSR will not compete with it.

The above two points can partially protect the security of BSR in the network.

However, if a legal BSR router is controlled by an attacker, it will also lead to the

above problem.

The source parameter in the related rule command is translated as BSR address in

bsr-policy command.

For the related commands, see acl and rule.

Configure BSR filter policy on a router. Only permit 1.1.1.1/32 to act as BSR and

regard others are invalid.

<3Com-pim] bsr-policy 1

<3Com-pim] quit

<3Com] acl number 1

<3Com-acl-basic-1] rule 0 permit source 1.1.1.1 0

c-bsr interface-type interface-number hash-mask-len [ priority ]

interface-type interface-number: Interface type and interface number of a router.

A candidate BSR is configured on this interface. PIM-SM must be enabled on this

interface, the configuration can take effect.

hash-mask-len: Mask length. The mask performs "And" operation with multicast

address at first and then performs the operation of searching for RP. The value

ranges from 0 to 32.

priority: Priority of the candidate BSR. The larger the value is, the higher the

priority of candidate BSR is. The value ranges from 0 to 255. By default, the

priority is 0.

Using the c-bsr command, you can configure a candidate BSR. Using the undo

c-bsr command, you can remove the candidate BSR configuration.

By default, no candidate BSR is set.

Since BSR and other devices in PIM domain need to exchange a great deal of

information during candidate BSR configuration, a relatively large bandwidth must

be guaranteed.

PIM Configuration Commands