[c-nsp] BGP sanity check

[Chuck Church]

Anyone,

	Need a quick BGP sanity check.  My AS has two BGP routers, each
peered to one upstream via eBGP taking full table.  iBGP between my two.  No
filtering between the two of mine, and next hop self set on both towards
each other.  My bgp summary on the two looks like this:

RTR 1:
Neighbor                   V    AS MsgRcvd MsgSent   TblVer  InQ OutQ
Up/Down  State/PfxRcd
X.Y.39.3                     4  MYAS  665455 2122859 23750575    0    0
2d12h      412485
216.215.152.1        4 11456 10228874 1416655 23750552    0    0 8w6d
430611

RTR 2:
Neighbor            V           AS MsgRcvd MsgSent   TblVer  InQ OutQ
Up/Down  State/PfxRcd
68.115.217.2    4        20115  235949   42325  4522187    0    0 2d12h
432461
X.Y.39.5               4        MYAS  195578  258293  4522187    0    0
2d12h       99941


I'm stumped trying to see why there is such a big difference between the
prefixes received between the two.   I confirmed with 'sh ip bgp nei x' that
RTR 1 is truly only sending 99,000 or so routes, even though it's taken the
full table from upstream.  

I'm thinking this might be because RTR 2's eBGP has the better path to most
destinations compared to RTR 1, thus RTR 1 sees this and doesn't send those
prefixes back towards RTR 2.  Does that sound right? 

Here's a prefix in question:
RTR 2:
BGP routing table entry for 209.209.144.0/20, version 3845458
Paths: (1 available, best #1, table default)
  Advertised to update-groups:
     9
  20115 1299 4323 10397, (received & used)
    68.115.217.2 from 68.115.217.2 (96.34.212.228)
      Origin IGP, localpref 100, valid, external, best

RTR 1:
BGP routing table entry for 209.209.144.0/20, version 23114388
Paths: (2 available, best #1, table Default-IP-Routing-Table)
  Not advertised to any peer
<-------------------------------------  This tells me it's not sent, trying
to figure out why
  20115 1299 4323 10397
X.Y.39.3 from X.Y.39.3 (X.Y.39.3)
      Origin IGP, metric 0, localpref 100, valid, internal, best
  11456 7029 1299 4323 10397, (received & used)
    216.215.152.1 from 216.215.152.1 (64.89.64.134)
      Origin IGP, localpref 100, valid, external

Anything else I should look for?

Thanks,

Chuck