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Name:BenjaminJoin In:Feb 21, 2019
CCNP [discussion] BGP DUAL-AS features detailed

Post by Benjamin » Jan 12, 2019

Basic concept • By default, only one BGP process can be started on a single router andcan belong to only one AS. DUAL AS allows us to run a secondary AS under theprimary AS without terminal BGP connections, thus providing a mechanism fornetwork migration.• During the migration, the router running DUAL AS can use both theprimary AS and the secondary AS to establish an EBGP connection with theexternal AS, and both can update and deliver BGP routes.• Reduce networkmigration time without disconnecting existing connections, and do not need tochange device BGP configuration in large batches

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