The different types of BGP statistics that are collected by the CPAA are:

• statistics for global BGP

• statistics for BGP Route Target

• statistics per Next Hop in global BGP

• statistics per Next Hop for each Route Target

• statistics for BGP Originated AS

The CPAA collects the following statistics for global BGP and for each RT:

• total number of sub-AS internal BGP routes

• total number of confederation internal BGP routes (only for global BGP)

• total number of external BGP routes

• number of BGP routes churn (added or withdrawn)

• number of BGP routes added

• number of BGP routes withdrawn

• number of flapped BGP routes (flap is defined as a route added after being withdrawn)

• number of changed Next-Hop

• number of changed LOCAL-PREF

• number of changed MED

• number of changed COMMUNITY

• number of changed AS-PATH

The CPAA collects the following statistics per Next Hop for global BGP and per RT:

• total number BGP routes

• number of BGP routes added or withdrawn

• number of BGP routes added

• number of BGP routes withdrawn

• number of flapped BGP routes (flap is defined as routes added or withdrawn)

• number of changed LOCAL-PREF

• number of changed MED

• number of changed COMMUNITY

• number of changed AS-PATH

Note: BGP statistics are identified by (RT:NH), where the where RT is the Route Target and NH is the Next Hop. For global BGP, the RT is 0. When the NH is 0, the statistics are aggregated for all of the next hops. The statistics for each next hop are identified by a none-zero NH. A non-zero RT specifies the specific RT.

Flaps are detected within a 2-minute interval. The counter starts when a route is withdrawn.

The CPAA collects the following statistics for each originated AS:

• total number of originated BGP routes

• number of BGP routes churn (added or withdrawn)

• number of BGP routes added

• number of BGP routes withdrawn