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MSUNAG  August 2007

MSUNAG August 2007

Subject:

Re: Merit about yesterday's trouble

From:

Matt Holtz <[log in to unmask]>

Reply-To:

Matt Holtz <[log in to unmask]>

Date:

Tue, 21 Aug 2007 15:41:43 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (55 lines)

Typically, don't remote power strips require the network to be operating?

Maybe I'm too removed from the routing world to know about all the cool 
new toys.



John Valenti wrote:
> A few other tidbits I picked up at the meeting:
> 
> 1. MSU's long distance phone calls are routed over the Internet.  The 
> default path uses Merit, but it can be manually re-routed over an AT&T 
> connection. (someone at Telecomm re-routed things after an hour of 
> downtime this morning).
> 
> 2. MSU is developing a remote hot site at Penn State. Currently in an 
> early stage of development, so there isn't a redundant network path to 
> it. Potentially the MSU web home page will be duplicated there 
> (eventually),
> 
> 3. Merit had to send techs from Ann Arbor to Grand Rapids and Kalamazoo 
> to reboot hardware this morning (they had a good reason for this). They 
> will be installing remote power management hardware; also trying to get 
> some local people signed up for access to those fiber rooms.
> 
> -John
> 
> 
> On August 21, at 12:52 PM August 21, Doug Nelson wrote:
> 
>> For those of you who didn't attend Merit's web conference, here's a
>> short update.  Merit engineers traced the source of the Merit Network
>> problems to the failure of an optical amplifier within the MiLR network,
>> following scheduled maintenance by the fiber carrier.  This failure
>> created a marginal optical fiber path, and accounted for the network
>> difficulties seen in the original outages between Thursday and Sunday,
>> and again this morning, after a second scheduled fiber maintenance
>> window.  The fiber path failure was compounded by a software failure
>> which repeatedly attempted to bypass the marginal link, and then rapidly
>> restore the link to service.  This process also caused the errant
>> switches to exhaust their memory due to a second software failure,
>> leading to additional packet switching and routing failures, cascading
>> throughout the Merit Network.
>>
>> Once the problematic link was disabled, service returned to a somewhat
>> stable state, but on limited bandwidth.
>>
>> As of 12:00 noon today, the Merit network appears to be operating
>> normally and at full capacity, but we are awaiting final word from
>> the Merit field and operations engineers on what was done and whether
>> service is fully restored.
>>
>> I will pass on additional details once Merit releases them.
>>
>> Doug

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