Configuring A Bsr - HP A8800 Configuration Manual

To configure C-RP timers globally:
Step
1. Enter system view.
2. Enter IPv6 PIM view.
3. Configure the C-RP-Adv
interval.
Configure C-RP timeout time.
4.
For more information about the configuration of other timers in IPv6 PIM-SM, see
common timers."

Configuring a BSR

An IPv6 BIDIR-PIM 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 collects and advertises RP information in the IPv6
BIDIR-PIM domain.
Configuring a C-BSR
C-BSRs must be configured on routers on the backbone network. When you configure a router as a C-BSR,
be sure to specify 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 the IPv6 BIDIR-PIM 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 message. The C-BSR with a higher priority wins. If there is
a tie in the priority, 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, while the winner
retains 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, thus to prevent a maliciously configured host from masquerading as a BSR. The same
configuration must be made on all routers in the IPv6 BIDIR-PIM domain. The following are typical BSR
spoofing cases and the corresponding preventive measures:
1. Some maliciously configured hosts can forge bootstrap messages to fool routers and change RP
mappings. Such attacks often occur on border routers. Because a BSR is inside the network
whereas hosts are outside the network, you can protect a BSR against attacks from external hosts
by enabling the border routers to perform neighbor checks and RPF checks on bootstrap messages
and discard unwanted messages.
2. When a router in the network is controlled by an attacker or when an illegal router is present in the
network, the attacker can configure this router as a C-BSR and make it win BSR election to control
the right of advertising RP information in the network. After being configured as a C-BSR, a router
automatically floods the network with bootstrap messages. Because a bootstrap message has a
hop limit value of 1, the whole network is not affected as long as the neighbor router discards these
bootstrap messages. Therefore, with a legal BSR address range configured on all routers in the
entire network, all these routers discards bootstrap messages that are not in the legal address
range.
Command
system-view
pim ipv6
c-rp advertisement-interval interval
c-rp holdtime interval
406
Remarks
N/A
N/A
Optional.
60 seconds by default.
Optional.
150 seconds
default.
"Configuring IPv6 PIM
by