[c-nsp] Cisco MultiLink PPP

[Cheung, Rick]

	I've noticed it takes up to a minute for a 7200 at 12.3.12 with
a PA-MC-2T3+ to detect an unplugged T1 circuit on a 2620 at 12.3.12.10,
with 2 point to point T1s in a multilink bundle.

	I've been reluctant to configure inband management, as we've
seen issues with frame relay end to end keepalives that time out upon
network load. The timers were hello intervals of 1 second, over a 30
second window. Different technology, I know.

	I'll try the keep 1 3 tonight and see if it improves when
configured on the four serial interfaces.



Thanks,
Rick Cheung

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Rodney Dunn
Sent: Thursday, March 24, 2005 10:30 AM
To: Lawrence Wong
Cc: Bruce Robertson; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Cisco MultiLink PPP

The keepalives are supposed to be protected
against congestion on transmit so the links
shouldn't flap on congestion due to L2 keepalive
loss.

However, given the L1 fault detection times on
the circuit (least common denominator theory)
I don't see any reason to set them lower than
2-3 seconds for retry.

I usually recommend 1 and 3.

Rodney



On Thu, Mar 24, 2005 at 07:17:02AM -0800, Lawrence Wong wrote:
> Is there any implication for setting "too low" a
> keepalive?
>
> --- Bruce Robertson <bruce at greatbasin.net> wrote:
> >  > What's the lead time like to detect a link
> > failure in
> >  > a MLPPP bundle?
> >
> > Once the link failure is detected, it's pretty much
> > instantaneous.  If you
> > test it with 'shutdown', though, you'll see a delay
> > of a few seconds unless
> > you configure 'keepalive 1' on the individual T1s.
> >
> > --
> > Bruce Robertson, President/CEO                     
> >     +1-775-348-7299
> > Great Basin Internet Services, Inc.    company-wide
> > fax: +1-775-348-9412
> > http://www.greatbasin.net                       my
> > efax: +1-775-201-1553
> >
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
_______________________________________________
cisco-nsp mailing list  cisco-nsp at puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-nsp
archive at http://puck.nether.net/pipermail/cisco-nsp/

This message, including any attachments, contains confidential information intended for a specific
individual and purpose and is protected by law. If you are not the intended recipient, please contact
sender immediately by reply e-mail and destroy all copies.
You are hereby notified that any disclosure, copying, or distribution of this message, or the taking
of any action based on it, is strictly prohibited.

WARNING: Computer viruses can be transmitted via email. The recipient should check this email
and any attachments for the presence of viruses. The sender accepts no liability for any damage
caused by any virus transmitted by this email. E-mail transmission cannot be guaranteed
to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive
late or incomplete, or contain viruses. The sender therefore does not accept liability for any errors
or omissions in the contents of this message, which arise as a result of e-mail transmission.