[c-nsp] Warm reload in Cisco 6500

[Keegan Holley]

Thanks all.


On Tue, Jan 4, 2011 at 11:49 AM, Christophe Fillot <cf at utc.fr> wrote:

> Keegan Holley wrote:
>
>> Is traffic still forwarded during the reload?  It's not explicitly
>> mentioned
>> whether or not the reload is control plane only.
>>
>>
> The "reload warm" command is not available on 12.2(33)SXI4a for sure
> (I've just checked it).
>
> The warm reload feature works by loading and uncompressing the new
> image before rebooting. The current IOS image is still running and
> forwarding traffic during this phase. When the device reboots, it skips
> the flash reading step since the new IOS is already present in memory
> (of course, the device doesn't forward traffic during this).
> Note that you have to configure "warm-reboot" and reboot to enable
> the feature (it has to reserve some memory iirc).
>
>
>
>
>> 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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>>>
>>>
>>>
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>
>
>