From: Scott Morris (smorris@internetworkexpert.com)
Date: Fri Aug 08 2008 - 17:07:32 ART
The "no keepalive" just keeps the interface up even if unplugged. As noted,
it does not make your loop go away or anything fun like that!
Very much like doing things such as the errdisable recovery won't make your
loop go away, but it will automatically re-enable your ports in lieu of an
error (just so that they can errdisable again momentarily!).
Spanning tree, or switchport trunk allowed commands may be used to actually
break the loop that may happen otherwise.
Scott
_____
From: cciestudy [mailto:cciestudy@mid-world.net]
Sent: Friday, August 08, 2008 3:52 PM
To: 'Igor Manassypov'; 'GS CCIE-Lab'
Cc: 'Scott Morris'
Subject: RE: IE Lab 20
From what I understand (I am not even close to an expert), is that the
keepalive is the loop detection mechanism on the switch. Turn it off and
the loop doesn't go away, it just doesn't detect. The STP addition was the
fix to detect and block the loop.
Scott. Correct me if I am wrong on this.
_____
From: Igor Manassypov [mailto:imanassypov@rogers.com]
Sent: Friday, August 08, 2008 2:08 PM
To: Igor Manassypov; cciestudy; 'GS CCIE-Lab'
Subject: RE: IE Lab 20
Besides, how does interface keepalive relate to spantree loops?
Igor Manassypov <imanassypov@rogers.com> wrote:
Hmm, whats the mechanism behind the interface keepalives that triggers the
interface to shutdown? Besides, I really doubt that just by disabling the
interface keepalive you avoid the loop, its just might stop going into
errdisable but the loop will still occur if there is one (?)
cciestudy <cciestudy@mid-world.net> wrote:
I finished that lab a few weeks ago. All I can say is it was a bugger to
solve. The IE message board has some good insight into why it was
occurring. I believe turning off interface keep-alives resolved the looping
problem. I believe it was SW4, F0/13, F0/15, F0/19, F0/21. Also, I tried
doing L2protocol-tunnel on STP also...
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Igor
Manassypov
Sent: Friday, August 08, 2008 9:58 AM
To: GS CCIE-Lab
Subject: IE Lab 20
Hi Gang,
Has anyone done internetwork expert's lab 20 recently? I am having a hard
time on the first section with STP where it keeps flipping interfaces to
err-disabled mode due to 'loopback error'. I am wondering if anyone was able
to solve it.
Thanks!
Igor M., M.Eng, P.Eng
Network Architect
Blogs and organic groups at http://www.ccie.net
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