[nsp] BGP routes received but not used

[Adam Kujawski]

We have a 3660 running 12.2(4)T3 with 256 MB RAM. We are multihomed to two 
providers, and take full routes from both (about 113000 routes from each 
provider, according to 'show ip bgp sum'). We recently enabled MBGP with 
one of the upstreams. Since that time, we've had to add a default route to 
one of our providers, because routes received via BGP were not always being 
seen. It does not appear to be a memory problem - the router reports over 
130 MB of free RAM.

'show ip route summary' gives the following:

IP routing table name is Default-IP-Routing-Table(0)
Route Source    Networks    Subnets     Overhead    Memory (bytes)
connected       1           28          2056        4176
static          4           30          2676        4896
ospf 100        0           5           320         720
   Intra-area: 3 Inter-area: 2 External-1: 0 External-2: 0
   NSSA External-1: 0 NSSA External-2: 0
bgp 20205       81508       30070       7140992     16230432
   External: 111578 Internal: 0 Local: 0
internal        1149                                1337436
Total           82662       30133       7146044     17577660

For example, www.cisco.com resolves to 198.133.219.25.

'show ip bgp 198.133.219.25' gives the following:

BGP routing table entry for 198.133.219.0/24, version 276733
Paths: (2 available, best #2)
   XXXX 109
     XXX.XXX.XXX.XXX from XXX.XXX.XXX.XXX (XXX.XXX.XXX.XXX)
       Origin IGP, metric 98, localpref 100, valid, external
   XXXX 109
     XXX.XXX.XXX.XXX from XXX.XXX.XXX.XXX (XXX.XXX.XXX.XXX)
       Origin IGP, localpref 100, valid, external, best

However, 'show ip route 198.133.219.25' gives the following:

% Network not in table

Without a default route, packets to 198.133.219.25 die at our router.

Any ideas?

Thanks,
Adam





      Adam Kujawski                      adamkuj@amplex.net
      Network Administrator              Cell: 419.261.3268
      Amplex Internet Services           Office: 419.720.3635