Configuring A Bsr - HP 6125XLG Configuration Manual

Configuring a C-RP
IMPORTANT:
When you configure a C-RP, reserve a relatively large bandwidth between the C-RP and the other devices
in the PIM-SM domain.
In a PIM-SM domain, if you want a router to become the RP, you can configure the router as a C-RP. The
BSR collects the C-RP information according to the received advertisement messages from C-RPs or the
auto-RP announcements from other routers. Then, it organizes the C-RP information into the RP-set
information, which is flooded throughout the entire network. Then, the other routers in the network can
determine the RPs for different multicast group ranges based on the RP-set information. HP recommends
configuring C-RPs on backbone routers.
To enable the BSR to distribute the RP-set information in the PIM-SM domain, the C-RPs must periodically
send advertisement messages to the BSR. The BSR learns the C-RP information, encapsulates the C-RP
information and its own IP address in a BSM, and floods the BSM to all PIM routers in the domain.
An advertisement message contains a holdtime option, which defines the C-RP lifetime for the advertising
C-RP. After the BSR receives an advertisement message from a C-RP, it starts a timer for the C-RP. If the BSR
does not receive any advertisement message when the timer expires, it regards the C-RP failed or
unreachable.
To guard against C-RP spoofing, you must configure a legal C-RP address range and the multicast group
range to which the C-RP is designated on the BSR. In addition, because every C-BSR might become the
BSR, you must configure the same filtering policy on all C-BSRs in the PIM-SM domain.
To configure a C-RP:
Step
1. Enter system view.
2. Enter PIM view.
3. Configure a C-RP.
4. (Optional.) Configure a legal
C-RP address range and the
multicast group range to
which the C-RP is designated.

Configuring a BSR

You must configure a BSR if C-RPs are configured to dynamically select the RP. In a network with a static
RP, this configuration task is unnecessary.
A PIM-SM domain can have only one BSR, but must have at least one C-BSR. Any router can be
configured as a C-BSR. Elected from C-BSRs, the BSR is responsible for collecting and advertising RP
information in the PIM-SM domain.
Command
system-view
pim
c-rp ip-address
[ advertisement-interval
adv-interval | group-policy
acl-number | holdtime hold-time |
priority priority ] *
crp-policy acl-number
74
Remarks
N/A
N/A
By default, no C-RP is configured.
By default, no restrictions are
defined.