Quick Reference Guide

PowerConnect B-Series TI24X Configuration Guide 483
53-1002269-02
PIM Sparse
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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.
PowerConnect(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.
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.
PowerConnect#clear pim rp-map
Syntax: clear pim rp-map
Statically specifying the RP
Dell recommends that you use the PIM Sparse protocol 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.
PowerConnect(config)#router pim
PowerConnect(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.