Hi
Good point. I see CFM has been introduced in SXI. But after wading
through the doco, particularly in the area of "Continuity Check
Messages" I see ....
-----
CFM CCMs have the following characteristics:
•Transmitted at a configurable periodic interval by MEPs. The interval
can be from 10 seconds to 65535 seconds, the default is 30.
•Contain a configurable hold-time value to indicate to the receiver
the validity of the message. The default is 2.5 times the transmit
interval.
-----
So I see we now have yet another protocol implementation that isn't
going to help us improve the availability of the networks we run. 10
second hello timers? That's soooo 1980's. :-)
According to feature navigator, the "UDLD Enhancements" feature which
I believe provides fast timers is available in SXH4 and SXI. Our
boxes are SXF and SXH3. Can someone with an SXI box check the
configuration range for
(config)#udld message time ?
<7-90> Time in seconds between sending of messages in steady
state
Thanks
David
...
On 05/02/2009, at 12:47 AM, Mauritz Lewies wrote:
I've not had much chance to play with it but will Ethernet CFM not
work
for this?
On Wed, 2009-02-04 at 08:49 +1000, David Hughes wrote:
Yup, that's exactly the situation. STP will work around some of the
problem caused by this but if you are presenting an etherchannel over
multiple xconnects you can't pick up the link failure of part of the
etherchannel without UDLD. We did some initial proof of concepts
with
2900s running 2 second timers and it was great. Imagine the look on
my face when we found out that 6500s don't have the functionality
of a
$1,000 access switch .....
So, is the config option on SXI still 7 seconds at best?
Thanks
David
...
On 03/02/2009, at 7:45 PM, Thomas Dupas wrote:
I assume it's a L2 link (EoMPLS), so BFD won't help much.
We're in the same situation, also stuck with UDLD timers and 2
parallel EoMPLS xconnects. I can't get the convergence lower then 20
seconds with the default UDLD, so I'm also hoping for fast UDLD
Best Regards,
Thomas
________________________________________
Van: [email protected] [[email protected]
] namens Gert Doering [[email protected]]
Verzonden: dinsdag 3 februari 2009 8:15
Aan: David Hughes
CC: Cisco NSP ((E-mail))'
Onderwerp: Re: [c-nsp] Fast UDLD timers in SXI?
Hi,
On Tue, Feb 03, 2009 at 04:30:50PM +1000, David Hughes wrote:
Can someone verify if 12.2(33)SXI offers fast UDLD timers (i.e.
down
to 1 second) or if we are still stuck with the old 7 sec timers.
We
can do 1 sec UDLD on 2900 class switches so I hope we see it in the
"premier switching platform" some time soon. We need some way to
pick
up a link failure at the far end of an EoMPLS xconnect in a
reasonable
time.
Can you use BFD?
(Yes, this is not answering your question - I don't know the answer
- but
it might be an alternative approach if this a layer 3 link)
gert
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fax: +49-89-35655025 [email protected]
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