Configuring A Bsr - HP VSR1000 Configuration Manual

Step
Enter system view.
1.
Enter IPv6 PIM view.
2.
Configure Anycast RP.
3.

Configuring a BSR

You must configure a BSR if C-RPs are configured to dynamically select the RP. You do not need to
configure a BSR when you have configured only a static RP but no C-RPs.
An IPv6 PIM-SM domain can have only one BSR, but must have a minimum of 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.
The BSR election process is summarized as follows:
Initially, each C-BSR regards itself as the BSR of the IPv6 PIM-SM domain and sends a BSM to
1.
other routers in the domain.
When a C-BSR receives the BSM from another C-BSR, it compares its own priority with the
2.
priority carried in the message. The C-BSR with a higher priority wins the BSR election. If a tie
exists 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 regards itself as the BSR. The
winner retains its own BSR address and continues to regard itself as the BSR.
The elected BSR distributes the RP-set information collected from C-RPs to all routers in the IPv6
PIM-SM domain. All routers use the same hash algorithm to get an RP for a specific IPv6 multicast
group.
Configuring a C-BSR
A BSR policy enables the router to filter BSR messages by using an ACL that specifies the legal BSR
addresses. Configure a BSR policy to guard against the following BSR spoofing cases:
•
Some maliciously configured hosts can forge BSMs to fool routers and change RP mappings.
Such attacks often occur on border routers
•
When an attacker controls a router on the network, the attacker can configure the router as a
C-BSR to win the BSR election. Through this router, the attacker controls the advertising of RP
information.
When you configure a C-BSR, follow these restrictions and guidelines:
•
Configure C-BSRs on routers that are on the backbone network.
•
Reserve a relatively large bandwidth between the C-BSR and the other devices in the IPv6
PIM-SM domain.
•
You must configure the same BSR policy on all routers in the IPv6 PIM-SM domain. The BSR
policy discards illegal BSR messages, but it partially guards against BSR attacks on the
network. If an attacker controls a legal BSR, the problem still exists.
To configure a C-BSR:
Step
Enter system view.
1.
Command
system-view
ipv6 pim [ vpn-instance
vpn-instance-name ]
anycast-rp
ipv6-anycast-rp-address
ipv6-member-address
Command
system-view
288
Remarks
N/A
N/A
By default, Anycast RP is not
configured.
You can repeat this command to
add multiple RP member
addresses to an Anycast RP set.
Remarks
N/A