Internet Routing Architectures, Second Edition

Organizing Command Groups in the New Configuration

There is no ambiguity present for command group 1, so they appear as global BGP configuration parameters. These commands appear only once in the configuration.

There is no ambiguity for command group 2, so they follow command group 1 under the global BGP parameters. BGP neighbors, with an exception to a case in VPN, are defined once in the configuration.

A new submode was introduced under router bgp autonomous-system configuration mode to define the per-AF commands.

The following output demonstrates the general configuration guidelines when using the new AF-style CLI:

router bgp autonomous-system
  address-family afi [sub-afi]
      redistribute protocol
      neighbor 1.2.3.4 activate
…
  exit-address-family ...