From: Allyn Baskerville (abaskerville@xxxxxxxxx)
Date: Thu Jan 25 2001 - 00:41:23 GMT-3
Have you tried to turn off ip route-cache? I've had multiple instances over
the past year where layer 2 was up but I couldn't connect via IP; however,
turning off the route-cache worked. Actually, I was able to clear the
route-cache, and a single packet made it across the link OK and all others
failed. Allyn
-----Original Message-----
From: Nodir Nazarov [mailto:nodir@datatone.com]
Sent: Wednesday, January 24, 2001 7:52 PM
To: Stephen Masraum
Cc: ccielab@groupstudy.com
Subject: RE: weird, weird, weird simple connection
If the problem is in telco (i still wonder why would you guess that) would
I successfully pass trhough BERT ? Would I see cdp neighbors ? Up until
now I thought that if L1 and L2 are fine, look at L3. Clean line tests and
cdp neighbors stopped me from calling telco. The best they can do - end to
end test, which will be clean.
before making swaps i wanted to make sure it's the router.
Nodir
On Wed, 24 Jan 2001, Stephen Masraum wrote:
> If you have a smartnet contract on your router you could always request an
> RMA, but you may have been talking about the downtime during changeover
that
> makes swapping for testing difficult. So neither side seems to have a
> problem seeing the traffic but it never gets past the 3/4ths mark. Again
my
> guess would be telco, but then again you have the same problem on another
> circuit on the same box, of course, that circuit probably goes through the
> same telco. Dunno, it's a weird one but, they do happen. Good luck,
>
> Steve
>
> -----Original Message-----
> From: Nodir Nazarov [mailto:nodir@datatone.com]
> Sent: Wednesday, January 24, 2001 7:14 PM
> To: Stephen Masraum
> Cc: ccielab@groupstudy.com
> Subject: RE: weird, weird, weird simple connection
>
>
>
> Stephen, here is config for R1:
>
> sh run
> Building configuration...
>
> Current configuration:
> !
> version 12.0
> service timestamps debug uptime
> service timestamps log uptime
> no service password-encryption
> !
> hostname R1
> !
> enable secret 5 xxxxxxxxxxxxxxxxxxxxx
> !
> ip subnet-zero
> !
> process-max-time 200
> !
> no ip directed-broadcast
> !
> interface FastEthernet0/0
> no ip address
> no ip directed-broadcast
> speed 10
> full-duplex
> no cdp enable
> !
> interface FastEthernet0/0.1
> encapsulation isl 1
> ip address x.x.x.x 255.255.255.252
> no ip redirects
> no ip directed-broadcast
> !
> interface Serial0/0
> ip address 192.168.1.2 255.255.255.0
> no ip directed-broadcast
> no ip mroute-cache
> !
> ip classless
> ip route 0.0.0.0 0.0.0.0 Serial0/0
> no ip http server
> !
> dialer-list 1 protocol ip permit
> dialer-list 1 protocol ipx permit
> !
> line con 0
> exec-timeout 0 0
> transport input none
> line aux 0
> line vty 0 4
> password xxxxxxxxxx
> login
> !
> !
> no scheduler allocate
> end
>
> And here is R2 (just related fragments):
>
> !
> controller T3 1/0
> clock source line
> ....
> t1 8 channel-group 0 timeslots 1-24
> ....
>
> !
> interface Serial1/0/8:0
> ip address 192.168.1.1 255.255.255.0
> no ip route-cache
> fair-queue 64 16 0
> !
>
> Again, interfaces are up/up. Unfortunately I can't get debugs from R1 (I
> have access to R2 and I had to dispatch somebody to get "sh tech" for TAC
> and config screens) but the debug below tells that there is no
> encapsulation problems (I am getting packets on R2 and sending from R2 on
> proper interface).
>
> Also I added another site (R3) on another channel of DS3 - same story. CDP
> shows up, all possible BERT tests on serial are fine. Then I decided to
> change IOS on 7206vxr from 12.0(7) to 12.1(6) - didn't help. Played with
> different switchings, tryed to do process swithing only - no results.
>
> At this moment I am thinking to blame 7206 router, but what exactly ? It's
> not easy to swap the box for test only..Not even an idea what went wrong.
>
> Nodir
>
> On Wed, 24 Jan 2001, Stephen Masraum wrote:
>
> > First thoughts are a layer 3 issue. If CDP is working and does see the
> > router at the other end and not some other router (have seen this when a
> > company is turning up multiple links between multiple sites, telco gets
> the
> > sites wrong and the connections aren't going where they should be) then
we
> > know layer 2 is working. It would be nice to have debugs from both
sides
> > (pinger and pingee simultaneously) when doing a ping. That may help. I
> > have seen what at first appears to be a good setup give a sending going
> one
> > way and an "encapsulation failed" going the other.
> > Good Luck,
> >
> > Steve
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > Nodir Nazarov
> > Sent: Monday, January 22, 2001 3:43 PM
> > To: ccielab@groupstudy.com
> > Subject: weird, weird, weird simple connection
> >
> >
> >
> > Hello, I need help in supposedly simplest configuration.
> >
> > I have 2 sites connected via T1.
> >
> >
> > R1<------------------>R2,
> > 192.168.1.2 192.168.1.1
> >
> > Where R1 has T1 and R2 has T1 channel in DS3. R1 - c2620. R2 - 7206vxr.I
> > have been doing similar scenario many many times and had no problem.
This
> > time however I see both serials up/up but I can't ping. When I ping from
> > R2 to R1 this is what I got on R2:
> >
> > 15w3d: IP: s=192.168.1.1 (local), d=192.168.1.2 (Serial1/0/8:0), len
100,
> > sending.
> > 15w3d: IP: s=192.168.1.1 (local), d=192.168.1.2 (Serial1/0/8:0), len
100,
> > sending.
> > 15w3d: IP: s=192.168.1.1 (local), d=192.168.1.2 (Serial1/0/8:0), len
100,
> > sending.
> >
> > When I ask to ping from R1 to R2 I see on R2:
> >
> >
> > 15w3d: IP: s=192.168.1.2 (Serial1/0/8:0), d=192.168.1.1 (Serial1/0/8:0),
> > len 100, rcvd 3
> > 15w3d: IP: s=192.168.1.1 (local), d=192.168.1.2 (Serial1/0/8:0), len
100,
> > sending
> > 15w3d: IP: s=192.168.1.2 (Serial1/0/8:0), d=192.168.1.1 (Serial1/0/8:0),
> > len 100, rcvd 3
> > 15w3d: IP: s=192.168.1.1 (local), d=192.168.1.2 (Serial1/0/8:0), len
100,
> > sending
> >
> > But no success. On both interfaces - no errors at all. I can see the
> > routers through cdp. Encapsulation on both ends - hdlc. No access lists
at
> > all, vanilla configuration.
> >
> > I know you will ask details about the other end, but all it has is:
> >
> > int se 0/0
> > ip address 192.168.1.2 255.255.255.0
> >
> > I am afraid to get something like this on the lab. Aren't you ??
> >
> > Nodir
> >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:27:43 GMT-3