Re: [netmod] Comment on draft-clacla-netmod-yang-model-update-02

[Balazs Lengyel <[e-mail]>]

Hello Randy,
I agree that the problem can not be eliminated, however it is still a 
nasty problem which we should try to avoid whenever possible. So if we 
can avoid it 75% of the time I am happy. (I don't often _configure_ 
firmware, so I am less worried about that :-)  )
regards Balazs


On 2017-11-16 03:07, Randy Presuhn wrote:
> Hi -
>
> On 11/15/2017 2:02 AM, Balazs Lengyel wrote:
>> While a server may correctly support multiple versions, the human 
>> operator on the CLI has a 99% chance of mixing up which version he is 
>> using. Humans will not check every type and leaf  to check that they 
>> remember the little differences between model versions. It is a 
>> recipe for human mistakes. According to some statistics 50% of 
>> downtime is caused by human errors, so we should not provide the 
>> operator with a gun to shoot himself. Ericsson has a rule never to 
>> have multiple versions of the same module on a network node.
>
> Does this mean that they require all line cards in a chassis to have
> exactly the same firmware revision level?  If so, when a card with a
> newer firmware revision level is swapped in, does that require all other
> cards of the same type in that chassis to also be replaced concurrently?
> Sounds like even a fairly routine/minor update/repair would effectively
> result in a system outage.
>
> Randy
>
> _______________________________________________
> netmod mailing list
> [e-mail]
> https://www.ietf.org/mailman/listinfo/netmod

-- 
Balazs Lengyel                       Ericsson Hungary Ltd.
Senior Specialist
Mobile: [phone]              email: [e-mail]