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Configuring IP Multicast Routing
Configuring IP Multicast Routing
DETAILED STEPS
To remove this device as a candidate BSR, use the no ip pim bsr-candidate global configuration command.
EXAMPLE
This example shows how to configure a candidate BSR, which uses the IP address 172.21.24.18 on a port 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
Configuring Candidate RPs
You can configure one or more candidate RPs. Similar to BSRs, the RPs should also have good connectivity to other
devices and be in the backbone portion of the network. An RP can serve the entire IP multicast address space or a portion
of it. Candidate RPs send candidate RP advertisements to the BSR. When deciding which devices should be RPs,
consider these options:
In a network of Cisco routers and multilayer switches where only Auto-RP is used, any device can be configured as
an RP.
In a network that includes only Cisco PIMv2 routers and multilayer switches and with routers from other vendors, any
device can be used as an RP.
In a network of Cisco PIMv1 routers, Cisco PIMv2 routers, and routers from other vendors, configure only Cisco
PIMv2 routers and multilayer switches as RPs.
This procedure is optional.
Command Purpose
1. configure terminal Enter global configuration mode.
2. ip pim bsr-candidate interface-id
hash-mask-length [priority]
Configure your switch to be a candidate BSR.
For interface-id, enter the interface 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.
3. end Return to privileged EXEC mode.
4. show running-config Verify your entries.
5. copy running-config
startup-config
(Optional) Save your entries in the configuration file.
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