[c-nsp] Warm reload in Cisco 6500

[Keegan Holley]

Is traffic still forwarded during the reload?  It's not explicitly mentioned
whether or not the reload is control plane only.


On Mon, Jan 3, 2011 at 5:44 PM, Phil Mayers <p.mayers at imperial.ac.uk> wrote:

> On 01/03/2011 12:04 PM, Grzegorz Janoszka wrote:
>
>>
>> There is a nice feature in Cisco IOS:
>>
>> http://www.cisco.com/en/US/docs/ios/fundamentals/configuration/guide/warm_reload.html
>>
>> According to Cisco software advisor (Find software with the features I
>> need), it is available in 12.2 for C6500/SUP720 in all releases of
>> trains SXH and SXI.
>>
>
> I think software advisor is incorrect (big surprise). Warm Reload is not
> available on this platform I'm pretty sure.
>
> If you have two supervisors you can "emulate" it with RPR+ mode. However
> when you force a switchover you still have 30-90 seconds of outage as your
> linecards reload, dependent on your linecard mix and configured features.
>
> There is also eFSU in later versions of IOS, giving 0-3 seconds outage if
> you have enough RAM on the linecards, but I'm not sure if you could (ab)use
> that to reload into the same IOS version; the argument to "issu loadversion"
> probably needs to be a different IOS than the running one?
>
> And of course both involve the expense of a 2nd SUP, which is why Cisco
> aren't incentivised to implement warm reload - their way, you spend more
> money!
>
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