[nsp] AToM (on 7600 w/ SUP720) : summary

[Tim Stevenson]

Put simply, we choose a mode - A or B - at bootup, based on the present line card configuration. If there are any DFC3A cards present, we are in A mode, otherwise, we are in B mode.

Once we choose a mode, we can not change the mode until a reboot, ie, issuing the "reload" command or power cycling the switch.

So in your example, no, you do not need to reboot to replace an A card, even if it is the last A card in the system. We remain in A mode - and that is true, even if you remove the last A card and replace it with a B card.

Tim

At 10:04 AM 1/8/2004, Burns, Keith gushed:
>Perhaps (I don't mean to assume) what is meant is that if a card fails, and
>you replace it, you need to reboot to make it active.
>
>Not exactly HIGH availability if that reboot causes 5min downtime to pass
>traffic again (that means BGP converging etc). You are at 99.999%
>availability for the year right there with no more outages.
>
>So perhaps clarification on "reboot" ? Are we talking the classic IOS "box
>goes away, box comes back and peers up etc" or in the NSO/SSF operation, is
>a "reboot" less intrusive to operations?
>
>Or perhaps my understanding of high availability is wrong?
>
>
>Keith Burns
>Principal Network Architect
>ICG Telecommunications
>IP Ph: 303-414-5385
>Cell:   303-912-3777 
>
>"The dogs may bark, but the caravan rolls on...."
>
>
>> -----Original Message-----
>> From: Tim Stevenson [mailto:tstevens at cisco.com]
>> Sent: Thursday, January 08, 2004 9:56 AM
>> To: cisco-nsp at puck.nether.net; cisco-nsp at puck.nether.net
>> Subject: Re: [nsp] AToM (on 7600 w/ SUP720) : summary
>> 
>> 
>> That is correct - if you install a DFC3A card in a PFC3B-XL 
>> system, the line card remains powered down.
>> 
>> Not sure what you mean, "then how about 'high avaibility 
>> solution'". What exactly is the question?
>> 
>> Tim
>> 
>> At 01:06 AM 1/8/2004, cisco-nsp-request at puck.nether.net maintained:
>> >one more snip
>> >
>> > * With a PFC3BXL and no DFC3A-equipped switching modules 
>> installed at bootup,
>> >   any DFC3A-equipped switching module installed after 
>> bootup remain powered down.
>> > * To use DFC3A-equipped switching modules with a PFC3BXL, 
>> the DFC3A-equipped switching
>> >   modules must be installed at bootup.
>> >
>> >And now question. If I correctly understand this too lines
>> >I can't insert DFC3A-equipped switching modules to chassis
>> >any time and start use. Is it true? and if yes then how about
>> >'high avaibility solution'?
>> 
>> 
>> Tim Stevenson, tstevens at cisco.com
>> Routing & Switching CCIE #5561
>> Technical Marketing Engineer, Catalyst 6500
>> Cisco Systems, http://www.cisco.com
>> IP Phone: 408-526-6759
>> ********************************************************
>> The contents of this message may be *Cisco Confidential*
>> and are intended for the specified recipients only.
>> 
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
********************************************************
The contents of this message may be *Cisco Confidential*
and are intended for the specified recipients only.