H3C Technologies H3C S10500 Series Switches - Manual (Page 176)

161
Then, the other routers in the network calculate the mappings between specific group ranges and the
corresponding RPs based on the RP-set. H3C recommends that you configure C-RPs on backbone routers.
To guard against C-RP spoofing, 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 must
configure the same filtering policy on all C-BSRs in the BIDIR-PIM domain.
Follow these steps to configure a C-RP:
To do... Use the command... Remarks
Enter system view system-view —
Enter public network PIM view or
VPN instance PIM view
pim [ vpn-instance vpn-instance-name ] —
Configure an interface to be a
C-RP for BIDIR-PIM
c-rp interface-type interface-number
[ group-policy acl-number | priority
priority | holdtime hold-interval |
advertisement-interval adv-interval ] *
bidir
Required
No C-RP is configured by
default.
NOTE:
•
When configuring a C-RP, ensure a relatively large bandwidth between this C-RP and the other devices
in the BIDIR-PIM 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... Use the command... Remarks
Enter system view system-view —
Enter public network PIM view or
VPN instance PIM view pim [ vpn-instance
vpn-instance-name ]
—
Enable auto-RP auto-rp enable
Required
Disabled by default
Configuring C-RP timers globally
To enable the BSR to distribute the RP-set information within the BIDIR-PIM domain, C-RPs must
periodically send C-RP-Adv messages to the BSR. The BSR learns the RP-set information from the received
messages, and encapsulates its own IP address together with the RP-set information in its bootstrap
messages. The BSR then floods the bootstrap messages to all PIM routers in the network.
Each C-RP encapsulates a timeout value in its C-RP-Adv messages. After receiving a C_RP-Adv message,
the BSR obtains this timeout value and starts a C-RP timeout timer. If the BSR fails to hear a subsequent
C-RP-Adv message from the C-RP within the timeout interval, the BSR assumes the C-RP to have expired
or become unreachable.
The C-RP timers need to be configured on C-RP routers.