One of the bogus interfaces on a 2621 router was causing the problem (area 1
router)! As soon as I swapped the router, everything worked fine!
UNBELIEVABLE!
Thanks to all who had suggested regarding to this problem.
Thanks again!
Albert
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
EA Louie
Sent: Tuesday, August 14, 2001 1:30 AM
To: [EMAIL PROTECTED]
Subject: Re: Datalink connectivity issue... a very interesting [7:15960]
Sounds like an ARP problem to me...did the ARP caches on both routers show
both IP addresses? If so, did the MAC addresses resolve correctly?
-e-
----- Original Message -----
From: Albert Y. Pak
To:
Sent: Monday, August 13, 2001 8:42 PM
Subject: RE: Datalink connectivity issue... a very interesting [7:15960]
> Hi Priscilla,
> I checked everything that I could... IP addresses (no duplication),
cables,
> switch port LEDs, VLAN configuration (I even switched with a regular
switch
> without VLAN configured), hard code full duplex on both ends, remove auto
> negotiation between router port and the switch port... Whatever you have
> suggested in here I have done it all at least twice. I don't see errors
when
> I did sh int e0/0 and sh int faste0/0. That is the weird part of all!!!!
> This problem gets my "rear end" kicked hard!
> I will look into it again. Hopefully, I will resolve this issue. And I
will
> definitely let you know.
> This is an interesting problem, isn't it? IP addresses and both interfaces
+
> protocols are up but you can't ping each other.
>
> WEIRD!!!!!!
>
> Thanks,
> Albert
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Priscilla Oppenheimer
> Sent: Monday, August 13, 2001 10:35 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Datalink connectivity issue... a very interesting [7:15960]
>
>
> What does "show int ethernet" on Router 1 and "show int fa" on Area 1
> Router show? Lots of errors? You say you turned off full duplex. On the
> routers or on the switches? You may want to hard code duplex on both ends
> of the connection, (although sometimes that doesn't work either. ;-)
>
> It seems like it could be an auto negotiation problem. Note that the
> negotiation occurs between R1 and its switch port. A separate negotiation
> occurs between Area 1 Router and its switch port. (Sorry if that's
obvious,
> but your wording made it sound like you thought those two separate
> connections could affect each other.) A show int will help you determine
if
> there's a problem. You'll see lots of collisions, late collisions, FCS
> errors, etc.
>
> You say VLAN 1 configuration is OK. Question your assumption. ;-) Can you
> do some testing without VLANs?
>
> Other theories are going to just be guesses because we don't have enough
> info, but check that the IP addresses and masks are really what you say
> they are and that the addresses don't belong to some other devices
> (duplicate IP addresses).
>
> It's annoying when you get a complicated network like you describe working
> and then some simple thing goes wrong, eh? Can you let us know what you
> find out? Thanks.
>
> Priscilla
>
> At 08:26 PM 8/13/01, Albert Y. Pak wrote:
> >Hi all,
> >I got a weird issue today in my company lab. I set up 3 OSPF areas. Area
0
> >consists of 4 routers (ABR). There are no backbone routers. And they are
> >connected via Frame Relay translating over ATM in fully mesh
configuration.
> >I label router 1, 2, 3 and 4. Router 1 connected to Area 1 router, Router
2
> >connected to Area 2 router, Router 3 connected to Area 3 router and
Router
> 4
> >connected to the internal office LAN. This set up was working fine last
> >Friday. Every interface on those routers can ping each other. A
workstation
> >from the internal office LAN can ping all the lab routers interfaces.
> >However, this morning, I lost Area 1.
> >
> >
> > area 2 router area 3 router
> > | |
> > Router 2-----Router 3
> > | \ / |
> > | \ / |
> > | ATM |
> > | / \ |
> > | / \ |
> > Router 4-----Router 1
> > | |
> > internal LAN area 1 router
> >
> >On Router 1, I have 2 interfaces which are T1 and e0/0. On the T1
> interface,
> >I define 3 subinterfaces and are connecting to ATM, Router 4 and Router
3.
> >The e0/0 has the IP 172.16.1.2/30. On area 1 router has faste0/0 and IP
> >172.16.1.1/30. Both Ethernet ports on area 1 router and Router 1 are
> >connected with Extreme Switch (Vlan 1).
> >When I do sh int on Router 1 and area 1 router, line + protocol on both
> >Ethernet interfaces are up. However, 172.16.1.2 can't ping
> 172.16.1.1!!?!?!?
> >And 172.16.1.1 can't ping 172.16.1.2!?!? If those IPs are up, I assume
> there
> >is a connectivity on layer 2. I shutdown both interfaces and brought them
> >up. It doesn't work. I thought may be because one Ethernet interface is a
> >fast Ethernet and there is problem with duplexing. I turn off full duplex
> on
> >both interfaces and it still doesn't work. The Vlan 1 configuration is
good
> >on the Extreme Switch.
> >So here is my $64,000 question. What went wrong?!
> >Thanks,
> >Albert
> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com
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