[c-nsp] IP Cache logs and BGP
Rodney Dunn
rodunn at cisco.com
Thu Oct 21 21:50:12 EDT 2004
Sorry for the late reply.
If you don't have a route that covers these
prefixes do you have a default they would
traverse?
If not, I think we are building an invalid
cache entry when we punt. I've seen that
happen with CEF before.
Rodney
On Tue, Oct 12, 2004 at 02:16:20AM +0530, Amol Sapkal wrote:
> On Mon, 11 Oct 2004 12:54:03 -0400, Rodney Dunn <rodunn at cisco.com> wrote:
> > Hmm...not sure then.
> >
> > If you do 'clear ip cache' do they come
> > right back the same way?
> > You can do "debug ip cache' to see them
> > being built.
>
> Yes, they come back the same way.
>
> Here is a paste:
>
> Prefix/Length Age Interface Next Hop
>
> 157.252.0.0/16 00:00:32 Se11/1/1 157.252.15.130
> 157.253.0.0/16 00:01:44 Se11/1/1 157.253.50.3
> 159.226.0.0/16 00:03:34 Se11/1/1 159.226.1.1
> 164.100.0.0/16 00:03:32 Se11/1/0 164.100.13.115
> 164.164.0.0/16 00:02:59 Se11/1/0 164.164.6.34
> 165.21.0.0/16 00:03:24 Se11/1/0 165.21.32.15
> 165.201.0.0/16 00:01:24 Se11/1/1 165.201.25.5
> 165.254.0.0/16 00:00:12 Se11/1/0 165.254.12.151
> 167.127.0.0/16 00:02:41 Se11/1/0 167.127.14.129
> 168.95.0.0/16 00:03:34 Se11/1/1 168.95.192.148
> 168.143.0.0/16 00:03:17 Se11/1/1 168.143.122.22
> 168.167.0.0/16 00:03:30 Se11/1/1 168.167.45.2
> 171.67.0.0/16 00:01:44 Se11/1/0 171.67.16.80
> 171.70.0.0/16 00:02:45 Se11/1/0 171.70.168.155
> 171.159.0.0/16 00:00:09 Se11/1/1 171.159.192.16
> 171.161.0.0/16 00:00:09 Se11/1/1 171.161.160.15
>
> 'debug ip cache' gives nothing much than what entry is being formed or
> destroyed from the cache.
>
>
>
>
> >
> > Rodney
> >
> >
> >
> > On Thu, Oct 07, 2004 at 11:25:31PM +0530, Amol Sapkal wrote:
> > > On Thu, 7 Oct 2004 09:18:18 -0400, Rodney Dunn <rodunn at cisco.com> wrote:
> > > > Are se 11/1/1 2 and 0 your ISP connections?
> > > >
> > >
> > > Yes, they load balance my default route.
> > >
> > > > What does sh ip route 12.2.51.0 say?
> > > >
> > >
> > > Subnet not in table
> > >
> > > > It could be, and does look to me
> > > > like it's a bug with how the fastcache is getting
> > > > populated.
> > > >
> > >
> > > Doesnt seem so, coz I have another edge running the same version, is
> > > of same make, and it shows the next hop proper for all such unknown
> > > networks (it shows my default route)
> > >
> > > > What code?
> > > >
> > >
> > > Version 12.2(11)T8, RELEASE SOFTWARE (fc1)
> > >
> > > > You running CEF on this box?
> > > >
> > >
> > > Yes. Not distributed cef though.
> > >
> > >
> > > > Rodney
> > > >
> > > >
> > > >
> > > > On Thu, Oct 07, 2004 at 09:16:01AM +0530, Amol Sapkal wrote:
> > > > > Hi Guys,
> > > > >
> > > > > I am running BGP with a couple of upstream providers who give me the
> > > > > routes for most of the destination networks.
> > > > >
> > > > >
> > > > > My 'sh ip cache' output shows the below:
> > > > >
> > > > > 12.2.51.0/30 00:04:50 Se11/1/1 12.2.51.2
> > > > > 12.2.55.0/30 00:08:49 Se11/1/1 12.2.55.2
> > > > > 12.2.73.132/30 00:00:34 Se11/1/2 12.2.73.134
> > > > > 12.2.142.8/30 00:09:42 Se11/1/1 12.2.142.9
> > > > > 12.2.169.20/30 00:02:33 Se11/1/1 12.2.169.23
> > > > > 12.2.209.48/30 00:14:25 Se11/1/0 12.2.209.50
> > > > > 12.3.7.0/30 00:00:21 Se11/1/1 12.3.7.2
> > > > > 12.3.10.128/30 00:02:12 Se11/1/0 12.3.10.130
> > > > > 12.3.126.28/30 00:23:28 Se11/1/0 12.3.126.30
> > > > > 12.3.145.32/30 00:33:01 Se11/1/1 12.3.145.33
> > > > > 12.3.206.0/30 00:15:17 Se11/1/0 12.3.206.3
> > > > > 12.4.27.40/30 00:10:40 Se11/1/0 12.4.27.40
> > > > > 12.4.81.144/30 00:19:33 Se11/1/0 12.4.81.146
> > > > > 12.4.124.0/30 00:03:44 Se11/1/0 12.4.124.3
> > > > > 12.4.124.4/30 00:16:44 Se11/1/1 12.4.124.4
> > > > > 12.4.184.4/30 00:26:48 Se11/1/2 12.4.184.5
> > > > > 12.4.184.20/30 00:02:00 Se11/1/1 12.4.184.20
> > > > > 12.4.211.56/30 00:08:21 Se11/1/2 12.4.211.59
> > > > > 12.4.218.40/30 00:05:33 Se11/1/0 12.4.218.42
> > > > > 12.4.218.128/30 00:17:32 Se11/1/0 12.4.218.130
> > > > > 12.4.254.8/30 00:06:52 Se11/1/1 12.4.254.10
> > > > >
> > > > >
> > > > > I am no way related to the 12.x.x.x network ( I get many many /30
> > > > > networks of 62.x.x.x, 63.x.x.x.x, 69.57.x.x to which I am no way
> > > > > related directly)
> > > > >
> > > > > I understand the column one could be the accessed networks. But then,
> > > > > the last column (4th) shows me the Next hop IP which has utterly
> > > > > nothing to do with my network.
> > > > >
> > > > > I may be wrong in my interpretation of the Next-Hop column, pls help
> > > > > to clarify the above behaviour.
> > > > >
> > > > > Is it normal?
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Warm Regds,
> > > > >
> > > > > Amol Sapkal
> > > > >
> > > > > --------------------------------------------------------------------
> > > > > An eye for an eye makes the whole world blind
> > > > > - Mahatma Gandhi
> > > > > --------------------------------------------------------------------
> > > > > _______________________________________________
> > > > > cisco-nsp mailing list cisco-nsp at puck.nether.net
> > > > > https://puck.nether.net/mailman/listinfo/cisco-nsp
> > > > > archive at http://puck.nether.net/pipermail/cisco-nsp/
> > > >
> > >
> > >
> > > --
> > > Warm Regds,
> > >
> > > Amol Sapkal
> > >
> > > --------------------------------------------------------------------
> > > An eye for an eye makes the whole world blind
> > > - Mahatma Gandhi
> > > --------------------------------------------------------------------
> >
>
>
> --
> Warm Regds,
>
> Amol Sapkal
>
> --------------------------------------------------------------------
> An eye for an eye makes the whole world blind
> - Mahatma Gandhi
> --------------------------------------------------------------------
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