Brocade TurboIron 24X Series Configuration Guide - Manual (Page 845)

Brocade TurboIron 24X Series Configuration Guide 811
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PIM Sparse
NOTE
Brocade recommends you specify 30 for IP version 4 (IPv4) networks.
The <priority> specifies the BSR priority. You can specify a value from 0 – 255. When the election
process for BSR takes place, the candidate BSR with the highest priority becomes the BSR. The
default is 0.
Configuring RPs
Enter a command such as the following to configure the Layer 3 Switch as a candidate RP.
TurboIron(config-pim-router)#rp-candidate ethernet 2
Syntax: [no] rp-candidate ethernet <portnum> | loopback <num> | ve <num>
The <portnum> | loopback <num> | ve <num> parameter specifies the interface. The Layer 3
Switch will advertise the specified interface IP address as a candidate RP:
• Enter ethernet <portnum> for a physical interface (port).
• Enter ve <num> for a virtual interface.
• Enter loopback <num> for a loopback interface.
By default, this command configures the Layer 3 Switch as a candidate RP for all group numbers
beginning with 224. As a result, the Layer 3 Switch is a candidate RP for all valid PIM Sparse group
numbers. You can change this by adding or deleting specific address ranges. The following example
narrows the group number range for which the Layer 3 Switch is a candidate RP by explicitly adding
a range.
TurboIron(config-pim-router)#rp-candidate add 224.126.0.0 16
Syntax: [no] rp-candidate add <group-addr> <mask-bits>
The <group-addr> <mask-bits> specifies the group address and the number of significant bits in
the subnet mask. In this example, the Layer 3 Switch is a candidate RP for all groups that begin
with 224.126. When you add a range, you override the default. The Layer 3 Switch then becomes a
candidate RP only for the group address ranges you add.
You also can change the group numbers for which the Layer 3 Switch is a candidate RP by deleting
address ranges. For example, to delete all addresses from 224.126.22.0 – 224.126.22.255, enter
the following command.
TurboIron(config-pim-router)#rp-candidate delete 224.126.22.0 24
Syntax: rp-candidate delete <group-addr> <mask-bits>
The usage of the <group-addr> <mask-bits> parameter is the same as for the rp-candidate add
command.
If you enter both commands shown in the example above, the net effect is that the Layer 3 Switch
becomes a candidate RP for groups 224.126.0.0 – 224.126.21.255 and groups 224.126.23.0 –
224.126.255.255.
Updating PIM-Sparse forwarding entries with new RP configuration
If you make changes to your static RP configuration, the entries in the PIM-Sparse multicast
forwarding table continue to use the old RP configuration until they are aged out.