Configuring A Bsr - HP A5500 SI Switch Series Configuration Manual

Configuring C-RP timers globally
To enable the BSR to distribute the RP-set information within the IPv6 PIM-SM domain, C-RPs must
periodically send C-RP-Adv messages to the BSR. The BSR obtains the RP-set information from the
received messages, and encapsulates its own IPv6 address together with the RP-set information in its
bootstrap messages. The BSR then floods the bootstrap messages to all IPv6 routers in the network.
Each C-RP encapsulates a timeout value in its C-RP-Adv messages. Upon receiving a C-RP-Adv message,
the BSR obtains this timeout value and starts a C-RP timeout timer. If the BSR fails to find a subsequent C-
RP-Adv message from the C-RP when the timer times out, the BSR assumes the C-RP to have expired or
become unreachable.
The C-RP timers must be configured on C-RP routers.
Follow these steps to configure C-RP timers globally:
To do...
Enter system view
Enter IPv6 PIM view
Configure the C-RP-Adv interval
Configure C-RP timeout time
NOTE:
For more information about the configuration of other timers in IPv6 PIM-SM, see
PIM common

Configuring a BSR

An IPv6 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 IPv6 PIM-SM domain.
Configuring a C-BSR
HP recommends that you configure C-BSRs on routers in the backbone network. When you are
configuring a router as a C-BSR, be sure to specify the IPv6 address of an IPv6 PIM-SM-enabled interface
on the router. The BSR election process is as follows:
Initially, every C-BSR assumes itself to be the BSR of this IPv6 PIM-SM domain and uses its interface
•
IPv6 address as the BSR address to send bootstrap messages.
When a C-BSR receives the bootstrap message of another C-BSR, it first compares its own priority
•
with the other C-BSR's priority carried in the message. The C-BSR with a higher priority wins. If a tie
in the priority exists, the C-BSR with a higher IPv6 address wins. The loser uses the winner's BSR
address to replace its own BSR address and no longer assumes itself to be the BSR, but the winner
keeps its own BSR address and continues assuming itself to be the BSR.
Configuring a legal range of BSR addresses enables filtering of bootstrap messages based on the
address range, thereby preventing a maliciously configured host from masquerading as a BSR. You must
make the same configuration on all routers in the IPv6 PIM-SM domain. Typical BSR spoofing cases and
the corresponding preventive measures are as follows:
Use the command...
system-view
pim ipv6
c-rp advertisement-interval
interval
c-rp holdtime interval
timers."
Remarks
—
—
Optional
60 seconds by default
Optional
150 seconds by default
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"Configuring IPv6