3Com S7906E Configuration Manual page 1043

announcements from other routers and organizes the information into an RP-set, which is flooded
throughout the entire network. Then, the other routers in the network calculate the mappings between
specific group ranges and the corresponding RPs based on the RP-set. We recommend that you
configure C-RPs on backbone routers.
To guard against C-RP spoofing, you need to configure a legal C-RP address range and the range of
multicast groups to be served on the BSR. In addition, because every C-BSR has a chance to become
the BSR, you need to configure the same filtering policy on all C-BSRs in the PIM-SM domain.
Follow these steps to configure a C-RP:
To do...
Enter system view
Enter public instance PIM view
or VPN instance PIM view
Configure an interface to be a
C-RP
Configure a legal C-RP
address range and the range of
multicast groups to be served
When configuring a C-RP, ensure a relatively large bandwidth between this C-RP and the other
devices in the PIM-SM domain.
An RP can serve multiple multicast groups or all multicast groups. Only one RP can forward
multicast traffic for a multicast group at a moment.
Enabling auto-RP
Auto-RP announcement and discovery messages are addressed to the multicast group addresses
224.0.1.39 and 224.0.1.40 respectively. With auto-RP enabled on a device, the device can receive
these two types of messages and record the RP information carried in such messages.
Follow these steps to enable auto-RP:
To do...
Enter system view
Enter public instance PIM view
or VPN instance PIM view
Enable auto-RP
Use the command...
system-view
pim [ vpn-instance
vpn-instance-name ]
c-rp interface-type
interface-number [ group-policy
acl-number | priority priority |
holdtime hold-interval |
advertisement-interval
adv-interval ] *
crp-policy acl-number
Use the command...
system-view
pim [ vpn-instance
vpn-instance-name ]
auto-rp enable
1-21
Remarks
—
—
Required
No C-RPs are configured
by default.
Optional
No restrictions by default
Remarks
—
—
Required
Disabled by default