distinguishing eBGP from show ip BGP

Reza Motamedi motamedi at cs.uoregon.edu
Wed Mar 11 18:32:33 UTC 2015


Hi Nanog,

For a research I want to distinguish the external AS peering from "show ip
BGP". In other words I want to see which entry show a path that immediately
sends packets to another AS. My understanding is that *status code* shows
if the route is internal, right? Does this mean if the *'i' *is not
present, the route is goes out of the AS in the next hop. On the same note,
can I use "Next Hop" to identify such entries?

I just included a sample report from a public looking glass in XO.


 show ip bgp  207.108.0.0/15 longer-prefixes
 BGP table version is 529230540, local router ID is 65.106.7.145
 * * *Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
               r RIB-failure, S Stale, m multipath, b backup-path, x
best-external, f RT-Filter, a additional-path
 Origin codes: i - IGP, e - EGP, ? - incomplete

    Network          Next Hop            Metric LocPrf Weight Path
 *  207.108.0.0/15   216.156.2.164            3             0 2828 209 i
 *                   65.106.7.101             2             0 2828 209 i
 *                   65.106.7.246             3             0 2828 209 i
 *                   65.106.7.55              3             0 2828 209 i
 *>                  216.156.2.162            2             0 2828 209 i
 *                   65.106.7.54              3             0 2828 209 i
 *                   65.106.7.252             2             0 2828 209 i
 *                   216.156.2.160            2             0 2828 209 i
 *                   65.106.7.56              3             0 2828 209 i
 *                   216.156.2.165            2             0 2828 209 i
 *                   65.106.7.144             2             0 2828 209 i

Best Regards
Reza Motamedi (R.M)
Graduate Research Fellow
Oregon Network Research Group
Computer and Information Science
University of Oregon


More information about the NANOG mailing list