[c-nsp] BGP network stops being advertized

[Justin Shore]

Jeff Fitzwater wrote:
> For some unknown reason we stop announcing the 128.112.0.0/16 to all our 
> ISPs.  This is the second time it has happened in about 2 months.
> 
> To get things going again I have to remove the BGP "network 128.112.0.0" 
> statement and just add it again.

Jeff,

What did your router think it was advertising when the problem occurred? 
  sh ip bgp a.b.c.d advertised-routes  will give you what you need.  For 
example:

7206-1.clr#sh ip bgp neighbors aa.bb.cc.dd advertised-routes
BGP table version is 20975573, local router ID is aa.bb.98.59
Status codes: s suppressed, d damped, h history, * valid, > best, i - 
internal,
               r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

    Network          Next Hop            Metric LocPrf Weight Path
*> aa.bb.96.0/21    0.0.0.0                  0         32768 i
*> aa.bb.104.0/21   10.64.0.129            200         32768 i
*> aa.bb.112.0/21   10.64.0.129            200         32768 i
*> aa.bb.120.0/21   0.0.0.0                  0         32768 i
*> aa.cc.192.0/21   0.0.0.0                  0         32768 i
*> aa.cc.200.0/21   10.64.0.129            200         32768 i

Total number of prefixes 6


I would be curious to see if there was a RIB-failure at the time of the 
problem.  Has your SP told you that you aren't advertising the prefix to 
them?  How are you getting the route that matches your advertisement 
into the RIB?  Local static or learned via your IGP?

Justin