Re: Switch Int Shows Up When Router Int Shut

What about 'sh cdp neigh'?

On May 7, 2009, at 5:55 , Joe Astorino wrote:

> 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
>
>
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> Version: 8.5.323 / Virus Database: 270.12.6/2084 - Release Date:
> 05/07/09
> 05:57:00
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Received on Thu May 07 2009 - 18:26:41 ART