RE: Switch Int Shows Up When Router Int Shut

Well I have definitely confirmed now, the issue is ONLY when connected to
routers (both 2600 and 3600 series) ethernet ports. The problem does not
exist when connecting to FastEthernet ports on the same devices. The
switches are all 3550 running c3550-ipservicesk9-mz.122-44.SE3.bin. This is
happening on all 4 of my 3550 switches, so it can't be a hardware issue with
all of my switches and/or all of my cables. Maybe I will try some older
code for fun. I think the only reason I put 12.2.44SE3 on there was in
hopes of ipv6 at some point, but now I know that doesn't work at all hehe.

Certainly an interesting issue though...the green LED comes on the switch,
and the switch continues to show "connected" under "show int status" even
when the interface is admin down on the router end. In other fun news, no
MAC address though in the CAM...

 - Joe

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Joe
Astorino
Sent: Thursday, May 07, 2009 3:51 PM
To: Charles.Henson_at_Regions.com
Cc: CCIE Groupstudy; nobody_at_groupstudy.com
Subject: Re: Switch Int Shows Up When Router Int Shut

I tried mixing it up on both sides but not sure I tried every combo yet. I
just left to go out for a bit but I will fiddle with it more later

----Original Message-----
From: Charles.Henson_at_Regions.com

Date: Thu, 7 May 2009 14:08:36
To: Joe Astorino<joe_astorino_at_comcast.net>
Cc: <ccielab_at_groupstudy.com>; <nobody_at_groupstudy.com>
Subject: RE: Switch Int Shows Up When Router Int Shut

Fe to E only. Nice. We'll if it's happening everywhere it's not physical.
Has to be (a) a bug or (b) by design. What happens if you hardcode down to
10/full? Yes, I understand the upstream E0/0 router port is shut....

Charles

  From: "Joe Astorino" <joe_astorino_at_comcast.net>

  To: <Charles.Henson_at_regions.com>

  Cc: <ccielab_at_groupstudy.com>, <nobody_at_groupstudy.com>

  Date: 05/07/2009 02:03 PM

  Subject: RE: Switch Int Shows Up When Router Int Shut

I'm quite sure the cables are OK because like I said it is multiple
devices,
multiple switches, and all the cables are pretty much brand new. No
keepalive witchcraft or anything ... Ummmm the image on the 3550's is
c3550-ipservicesk9-mz.122-44.SE3.bin.
I think I have it isolated to only ports that are connected to routers
ETHERNET interfaces (problem does not appear on ports connected to routers
with FastEthernet interfaces)

-----Original Message-----
From: Charles.Henson_at_Regions.com [mailto:Charles.Henson_at_Regions.com]
Sent: Thursday, May 07, 2009 2:57 PM
To: Joe Astorino
Cc: ccielab_at_groupstudy.com; nobody_at_groupstudy.com
Subject: RE: Switch Int Shows Up When Router Int Shut

Ok. I was looking more for like "no keep" on the switchport or similar
witchcraft. It's really interesting. I've seen this before with old(er)
gear
or with loop testing but not on a 3550. Are you sure the cable is legit and
you are also seeing it everywhere else? What flavor are you running on the
switch?

Charles

  From: "Joe Astorino" <joe_astorino_at_comcast.net>

  To: <Charles.Henson_at_Regions.com>

  Cc: <ccielab_at_groupstudy.com>, <nobody_at_groupstudy.com>

  Date: 05/07/2009 01:50 PM

  Subject: RE: Switch Int Shows Up When Router Int Shut

Hey Charles,

Nothing out of the ordinary... Just

Switch mode acc
Switch acc vlan 100

I had dot1x on but removed all of that interace configuration. I did move
one of my router connections to a different switchport that had bare bone
default configuration and it still came up on the switch!

-----Original Message-----
From: Charles.Henson_at_Regions.com [mailto:Charles.Henson_at_Regions.com]
Sent: Thursday, May 07, 2009 2:48 PM
To: Joe Astorino
Cc: ccielab_at_groupstudy.com; nobody_at_groupstudy.com
Subject: RE: Switch Int Shows Up When Router Int Shut

Joe,
      Can you more the switch side connection to another port? If so, does
it do the same thing? Is there anything odd on the switch to nail the port
up? generic switch port config?

Charles

  From: "Joe Astorino" <joe_astorino_at_comcast.net>

  To:

  Cc: <ccielab_at_groupstudy.com>

  Date: 05/07/2009 01:43 PM

  Subject: RE: Switch Int Shows Up When Router Int Shut

 This is really freaking me out now...it's happening across multiple of my
3550's going to multiple routers of different platforms. Weird!

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Joe
Astorino
Sent: Thursday, May 07, 2009 2:31 PM
Cc: ccielab_at_groupstudy.com
Subject: RE: Switch Int Shows Up When Router Int Shut

No, 3550 switch going to 2600 routers ethernet interfaces. reboot both
devices, no errors on either

  _____

From: Darby Weaver [mailto:ccie.weaver_at_gmail.com]
Sent: Thursday, May 07, 2009 2:27 PM
To: Joe Astorino
Cc: ccielab_at_groupstudy.com
Subject: Re: Switch Int Shows Up When Router Int Shut

I've seen this and it seems like it happened on failing equipment. I guess
you could change the IOS just in case.

But it might be the hardware.

Is this a 4006 by chance?

On Thu, May 7, 2009 at 2:21 PM, Joe Astorino <joe_astorino_at_comcast.net>
wrote:

Thanks Ron, but this is live equipment...and is happening on several
devices! 2600s going back to 3550's

"He not busy being born is busy dying" -- Dylan

-----Original Message-----
From: ron.wilkerson_at_gmail.com [mailto:ron.wilkerson_at_gmail.com]
Sent: Thursday, May 07, 2009 2:18 PM
To: Joe Astorino; ccielab_at_groupstudy.com
Subject: Re: Switch Int Shows Up When Router Int Shut

Bad cable...
If dynamips, reboot!
------Original Message------
From: Joe Astorino
Sender: nobody_at_groupstudy.com
To: ccielab_at_groupstudy.com
ReplyTo: Joe Astorino
Sent: May 7, 2009 14:13
Subject: Switch Int Shows Up When Router Int Shut

So, am I losing my mind or what?! Anybody else experience this? I have R1
e0/0 connected to Cat1 fa0/1. On R1 I have shutdown the interface. I have
verified it shows as admin down a million times. On the switch side the
port still shows as "connected" and has a link light. Yes, I'm sure it is
the right device. WTF?!

"He not busy being born is busy dying" -- Dylan

Blogs and organic groups at http://www.ccie.net <http://www.ccie.net/>
Received on Thu May 07 2009 - 19:55:22 ART