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Last Run: Thu May 17 04:36:50 UTC 2012

Internet2 - General BGP Statistics

The Border Gateway Protocol, or BGP, is used to advertise and receive routes from peers. It generally has two purposes. In its External mode it is used to receive routes from external customers and to advertise routes to those customers. In its Internal mode it is used by the backbone routers to inform each other of which external routes can be reached by which backbone router.

For Example, external router E uses BGP in external mode to advertise some prefixes to backbone router A. A uses BGP in internal mode to tell backbone router B about the routes that E is advertising. B in turn uses BGP in external mode to tell another external customer F about the routes that E is advertising.

The routing RIB contains all of these routes. Seperate RIBs are maintained for IPv4 and for IPv6. In the following table you can see the total number of routes in the RIBs for both Unicast & Multicast routes. Routes in the History, Suppressed, Damped, or Pending catatorgies generally have something wrong with them for some reason and are not being used by the router. The number of Total routes should be greater than the number of Active routes. If we receive the same route from two different cusomters then the Total field would be incremented by 2, but the Active field would only be incremented by 1 since we choose one of the routes as "best".

The first column for each router represents the dta for Unicast routes, The second column for each router represents the data for Multicast routes.

IPv4 RIB IPv6 RIB IPv4 Uni iBGP IPv4 Multi iBGP IPv6 Uni iBGP IPv6 Multi iBGP External Peerings

General BGP RIB Statistics - IPv6

Type of Prefix		seat		newy32aoa		wash		chic		atla		kans		salt		losa		hous
Total		668295	0	1331	148	692925	0	667749	0	898803	0	898795	0	5554	898801	667998	0	898850	0
Active		238558	0	788	88	231136	0	238424	0	238458	0	238451	0	3310	238461	238459	0	238472	0
History		0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Damped		0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Pending		0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Suppressed		0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Total External		0	0	541	54	0	0	0	0	0	0	0	0	69	0	0	0	0	0
Active External		0	0	288	43	0	0	0	0	0	0	0	0	59	0	0	0	0	0
Suppressed External		0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Total Internal		668295	0	790	94	692925	0	667749	0	898803	0	898795	0	5485	898801	667998	0	898850	0
Active Internal		238558	0	500	45	231136	0	238424	0	238458	0	238451	0	3251	238461	238459	0	238472	0
Suppressed Internal		0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

The next two tables represent the number of IPv4 Unicast & IPv4 Multicast routes in the iBGP Mesh. Each backbone router maintains an internal BGP session to every other backbone router. All of the routes learned from a routers external peers are then advertised to all of he routers internal peers.

The two columns represent the total number of routes advertised in the second column and the total number of routes used in the first column. The numbers can differ, for example, if a router receives a route for which it already had a better route.

The following table lists all of the external BGP peers for each router. Each peer can be configured for Unicast and/or Multicast. For both the Unicast & Multicast family we display the total number of routes received (in the second column) as well as the total number of routes active and used (in the first column.) Again, these can differ if, for example, the router receives a route from a peer for which it already has a better route. It could also differ if the peer sends us a route and we reject it for some reason, such as it being a route they are not permitted to advertise to us.

Red indicates that a peer has a BGP session configured but that the BGP session is not up and working. Yellow indicates that we are supressing some of the peers routes for some reason. An N/A indicates that the peer has not negotiated that family for some reason, which is not that unusual.

seat newy32aoa wash chic atla kans salt losa hous