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Configuring the Router's Bootstrap Router Priority

To determine which router is the RP, all routers within a PIM domain collect bootstrap messages. A PIM domain is a contiguous set of routers that implement PIM; all are configured to operate within a common boundary. The domain's bootstrap router originates bootstrap messages, which are sent hop by hop within the domain. The routers use bootstrap messages to distribute RP information dynamically and to elect a bootstrap router when necessary.

The bootstrap configuration hierarchy supports both IPv4 and IPv6 multicasting. It can be combined with the bootstrap statements supported in IPv4 only, as long as the added statements are used for IPv6 only, but this is not recommended. There is a change in the meaning of the bootstrap priority when the value is set to 0.

In the IPv4 configuration hierarchy, specifying the value 0 (zero) for the bootstrap-priority statement disables the function for IPv4 and does not cause the router to send BSR packets with a 0 in the priority field. In the combined IPv4 and IPv6 configuration hierarchy, specifying the value 0 for the priority statement does not disable the function, but causes the router to send BSR packets with a 0 in the priority field. To disable the bootstrap function in the IPv4 and IPv6 hierarchy, delete the configuration statements.

A commit error occurs if the same IPv4 bootstrap statements are included in both the IPv4-only and the IPv4-and-IPv6 sections of the hierarchy. The error message is “duplicate IPv4 bootstrap configuration.”

We recommend that legacy IPv4-only configurations be transitioned to the IPv4 and IPv6 configuration hierarchy.

To modify the bootstrap priority for IPv4 or IPv6, include the priority statement for the appropriate address family: inet for IPv4 and inet6 for IPv6. The router with the highest priority value is elected to be the bootstrap router. In the case of a tie, the router with the highest IP address is elected to be the bootstrap router.




priority number;

For a list of the hierarchy levels at which you can include this statement, see the statement summary section for this statement.

This sample snippet sets a bootstrap priority of 1 for both IPv4 and IPv6 multicasts:



pim {


rp {


bootstrap {


family inet {
priority 1;
}




family inet6 {
priority 1;
}


}


}


}

An error results when this configuration is combined with the use of the bootstrap-priority statement.

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