UMN:CLI
User Manual
V8102
580
11.3.4
Bootstrap Router
The bootstrap router (BSR) mechanism is one way that a multicast router can learn the
set of group-to-RP mappings required in order to function.
All multicast routers in PIM-SM domain can be potentially the bootstrap router (BSR);
they are all considered as candidate BSRs. To elect the BSR among the candidate BSRs,
each candidate BSR floods the bootstrap messages with its information to the domain.
When receiving the bootstrap messages, the candidate BSRs examine the messages,
and then the one with the highest priority is elected as the BSR. If more than one candi-
date with the same highest priority, the one with the higher IP address is elected.
The elected BSR is responsible to periodically send out bootstrap messages including the
RP-set, allowing all the routers in the PIM-SM domain determine which router is the RP
that covers given multicast groups.
11.3.4.1
Interface for Candidate BSR
To configure an interface to the candidate BSR, use the following command.
Command
Mode
Description
ipv6 pim bsr-candidate
IFNAME
Global
Configures an interface to the candidate BSR.
IFNAME: interface name
0-128: hash mask length for RP selection
0-255: priority for candidate BSR
ipv6 pim bsr-candidate
IFNAME
<0-128>
ipv6 pim bsr-candidate
IFNAME
<0-128> <0-255>
no
ipv6
pim
bsr-candidate
IFNAME
Configures an interface not to the candidate BSR.
11.3.4.2
Clearing RP-Set
The BSR periodically distributes the bootstrap message that includes a set of the infor-
mation received from each candidate RP (RP-set) to all the routers in the PIM-SM domain.
You can also clear all RP-set to reset.
To clear all RP-set, use the following command.
Command
Mode
Description
clear ipv6 pim sparse-mode bsr
rp-set *
Enable
Global
Clears all RP-set.
11.3.4.3
Displaying BSR Configuration
To display the BSR information, use the following command.
Command
Mode
Description
show ipv6 pim bsr-router
Enable
Global
Shows the BSR information.
