3Com 3031 Command Reference Manual page 711

3com 3031: reference guide

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PIM Configuration Commands

undo crp-policy

acl-number: ACL number used by C-RP filter policy, ranging from 100 to 199.

Using the crp-policy command, you can restrict the range for valid C-RP and the

group range served by each C-RP so as to prevent C-RP cheating. Using the undo

crp-policy command, you can restore the normal state without any range

restriction and regard all the messages received are valid.

In PIM SM network which uses BSR mechanism, any router can set itself as a C-RP

serving the specific group range. If it is elected in RP election, it will become an RP

serving in the group range.

In BSR mechanism C-RP router unicasts C-RP information to BSR router which is

responsible for advertising all C-RP information to the whole network by using BRP

information.

To prevent C-RP cheating, crp-policy is needed to be configured on BSR router to

restrict the range for valid C-RP and the group address range it serves. Each C-BSR

may become a BSR possibly, so the same filter policy should be configured on each

This command uses the ACL numbered from 100 to 199. The parameter source in

the related rule command indicates C-RP address and destination indicates the

group range the C-RP serves. Upon matching the received C-RP message, only

when the C-RP address in the packet matches source address and the group

address range in the packet is the subset of that in ACL, can this configuration be

regarded successful.

For the related commands, see acl and rule.

Configure C-RP policy on C-BSR router. Only permit 1.1.1.1/32 to act as C-RP

which only serves the group range 225.1.0.0/16.

<3Com-pim] crp-policy 100

<3Com-pim] quit

<3Com] acl number 100

<3Com-acl-adv-100] rule 0 permit ip source 1.1.1.1 0 destination

225.1.0.0 0.0.255.255

debugging pim common

debugging pim common { all | event | packet | timer }

undo debugging pim common { all | event | packet | timer }