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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter 24 Configuring IP Multicast Routing
Configuring IP Multicast Routing
Configuring Candidate BSRs
You can configure one or more candidate BSRs. The devices serving as candidate BSRs should have
good connectivity to other devices and be in the backbone portion of the network.
Beginning in privileged EXEC mode, follow these steps to configure your multilayer switch as a
candidate BSR:
To remove this device as a candidate BSR, use the no ip pim bsr-candidate global configuration
command.
This example shows how to configure a candidate BSR, which uses the IP address 172.21.24.18 on
Gigabit Ethernet interface 0/2 as the advertised BSR address, uses 30 bits as the hash-mask-length, and
has a priority of 10.
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# ip address 172.21.24.18 255.255.255.0
Switch(config-if)# ip pim sparse-dense-mode
Switch(config-if)# ip pim bsr-candidate gigabitethernet0/2 30 10
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
ip pim bsr-candidate interface-id
hash-mask-length [priority]
Configure your multilayer switch to be a candidate BSR.
•
For interface-id, enter the interface type and number on this switch
from which the BSR address is derived to make it a candidate. This
interface must be enabled with PIM. Valid interfaces include
physical ports, port channels, and VLANs.
•
For hash-mask-length, specify the mask length (32 bits maximum)
that is to be ANDed with the group address before the hash function
is called. All groups with the same seed hash correspond to the same
RP. For example, if this value is 24, only the first 24 bits of the
group addresses matter.
•
(Optional) For priority, enter a number from 0 to 255. The BSR with
the larger priority is preferred. If the priority values are the same,
the device with the highest IP address is selected as the BSR. The
default is 0.
Step 3
end
Return to privileged EXEC mode.
Step 4
show running-config
Verify your entries.
Step 5
copy running-config startup-config
(Optional) Save your entries in the configuration file.
