Technical Documentation

Configuring Address-Assignment Pool Linking

Address-assignment pool linking enables you to specify a secondary address pool for the router to use when the primary address-assignment pool is fully allocated. When the primary pool is has no available addresses, the router automatically switches over to the linked secondary pool and begins allocating addresses from that pool. The router uses a secondary pool only when the primary address-assignment pool is fully allocated.

You can create a chain of multiple linked pools. For example you can link pool A to pool B, and link pool B to pool C. When pool A has no available addresses, the router switches to using pool B for addresses. When pool B is exhausted, the router switches to pool C. There is no limit to the number of linked pools in a chain. However, you cannot create multiple links to or from the same pool—a pool can be linked to only one secondary pool, and a secondary pool can be linked from only one primary pool. Also, two linked primary and secondary pools must be of the same family type, either IPv4 or IPv6.

To link an address-assignment pool to a secondary pool:

  1. Specify the name of the primary address-assignment pool.
    [edit access]user@host# edit address-assignment pool pool-name
  2. Configure the secondary pool to which the primary pool will be linked.
    [edit access address-assignment pool isp_1]user@host# set link pool-name

Published: 2010-04-15