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Foundry Configuration Guide for the FESX, FSX, and FWSX
19 - 18
© Foundry Networks, Inc.
December 2005
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.
FastIron SuperX Router(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 sub-net 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
range(s) 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:
FastIron SuperX Router(config-pim-router)# rp-candidate delete 224.126.22.0 24
Syntax:
[no] 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.
The
clear pim rp-map
command allows you to update the entries in the static multicast forwarding table
immediately after making RP configuration changes. This command is meant to be used with
rp-address
command.
To update the entries in a PIM sparse static multicast forwarding table with new RP configuration, enter the
following command at the privileged EXEC level of the CLI:
FastIron SuperX Router(config)# clear pim rp-map
Syntax:
clear pim rp-map
Statically Specifying the RP
Foundry Networks recommends that you use the PIM Sparse protocol’s RP election process so that a backup RP
can automatically take over if the active RP router becomes unavailable. However, if you do not want the RP to be
selected by the RP election process but instead you want to explicitly identify the RP by its IP address, you can do
using the following CLI method.
If you explicitly specify the RP, the Layer 3 Switch uses the specified RP for all group-to-RP mappings and
overrides the set of candidate RPs supplied by the BSR.
NOTE:
Specify the same IP address as the RP on all PIM Sparse routers within the PIM Sparse domain. Make
sure the router is on the backbone or is otherwise well connected to the rest of the network.
To specify the IP address of the RP, enter commands such as the following:
FastIron SuperX Router(config)# router pim
FastIron SuperX Router(config-pim-router)# rp-address 207.95.7.1
Syntax:
[no] rp-address <ip-addr>
The <ip-addr> parameter specifies the IP address of the RP.
The command in the example above identifies the router interface at IP address 207.95.7.1 as the RP for the PIM
Sparse domain. The Layer 3 Switch will use the specified RP and ignore group-to-RP mappings received from the
BSR.
Summary of Contents for FastIron Edge Switch X424
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