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Dell EMC SmartFabric OS10 User Guide Release 10.5.0

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Override bootstrap router updates

A bootstrap router (BSR) is a router in a PIM domain that helps to automatically discover the Rendezvous Point (RP) for a given multicast group in a multicast network. PIM routers use the BSR to obtain the RP IP address. You can also statically configure an IP address for the RP. If you configure a static RP for a group, to override BSR updates with the static RP configuration, use the override option in the ip pim rp-address command. If you do not explicitly use the override option and:

  • The prefix length of the static RP is the same as the RP advertised in the BSR updates, the BSR RP takes precedence over the statically configured RP.
  • If the prefix length of the static RP and the BSR RP does not match, OS10 selects the router having the longest-match prefix as the RP.

To override BSR updates:

OS10# configure terminal
OS10(config)# ip pim rp-address 20.1.1.1 255.1.2.3/24 override
NOTE If you have enabled the override option, configuring static RP without using the override option does not remove the override configuration. You must delete the static RP configuration using the override option and then reconfigure static RP again.

To view the RP for a multicast group, use the show ip pim rp command.

OS10# show ip pim rp
Group                  RP
---------------------------------
225.1.1.1           171.1.1.1
225.1.1.2           171.1.1.1
225.1.1.3           171.1.1.1
225.1.1.4           171.1.1.1
225.1.1.5           171.1.1.1
225.1.1.6           171.1.1.1

To view the RP for a multicast group range, use the show ip pim rp mapping command.

OS10# show ip pim rp mapping
PIM Group-to-RP Mappings
Group(s): 230.1.1.1/32  
RP:14.1.1.1, v2
  Info source: 42.1.1.1, via bootstrap, priority 255
     expires: 00:01:53

Group(s): 231.1.1.1/32
RP: 9.1.1.1, v2
  Info source: 42.1.1.1, via bootstrap, priority 254
     expires: 00:01:54

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