[j-nsp] Urgent downgrade pic

[Nilesh Khambal]

Hi Shekar,

Is there any specific reason, you downgrading from 9.4 to 7.2? Which type of
interfaces are not coming up? Most likely they are not supported in 7.2. You
need to check Supported PIC page in the external documentation to find the
release the particular PIC is supported from

For example this is for M10i.

http://www.juniper.net/techpubs/en_US/release-independent/junos/topics/refer
ence/general/pic-m10i-supported.html

If the PIC is not supported in your 7.2 release, there is pretty much
nothing you can do to make it work in that release. No firmware
upgrade/downgrade can help here.

If your PIC is found supported from the documentation, you should check if
at least FPCs are detected and the PICs being marked as "unsupported
hardware" in "show chassis hardware" output. If not then, probably your
chassisd daemon responsible for detecting and bringing up the FPC/PIC might
be having issue. Look under /var/tmp or /var/crash to see if any coredumps
are generated. Again, since 7.2 is an EoLed release, this issue can not be
fixed in 7.2 anymore. But most likely, it might be already fixed in the
later releases. This is all assuming your PIC hardware is supported in 7.2.

Also, during the upgrade or downgrade, you are not supposed to jump more
than 3 major JUNOS releases at a time. For.e.g from 9.3 you need to upgrade
to 9.6 before going to 10.0. Similarly, for downgrade It is usually
mentioned in the release notes of every release in the upgrade instructions.

Thanks,
Nilesh

On 11/13/09 5:16 AM, "chandrasekaran iyer" <shekar1975 at gmail.com> wrote:

> Also i wanted to know what are the steps that happen when image is
> loaded, how the image is loaded in fpc, when does it happen.
> Any document for this.
> 
> Also while downgrading, why do we need to go from say 9.4 to 9.0 than
> to 8.5 then 8.0. Any specific reason.
> 
> Thanks,
> 
> Shekar
> 
> On Fri, Nov 13, 2009 at 6:25 PM, chandrasekaran iyer
> <shekar1975 at gmail.com> wrote:
>> On Fri, Nov 13, 2009 at 6:25 PM, chandrasekaran iyer
>> <shekar1975 at gmail.com> wrote:
>>> Hi,
>>> 
>>>   When i download from 9.4 to 7.2 , i dont' see the interfaces coming
>>> up after issuing "run show interface terse".
>>>  Also it seems we cannot downgrade directly from 9.4 to 7.2, we have
>>> to step by step downgrade like 9.4 to 9.0 than 9.0 to 8.5.
>>> 
>>>   Could you please clarify this point. how to downgrade? why not able
>>> to see the interfaces? The router model is M20.
>>> 
>>> Thanks,
>>> 
>>> Shekar.B
>>> 
>>> On Thu, Nov 12, 2009 at 9:16 AM, Truman Boyes <truman at suspicious.org> wrote:
>>>> 
>>>> On 11/11/2009, at 9:17 PM, Daniel Verlouw wrote:
>>>> 
>>>>> On Wed, 2009-11-11 at 15:19 +0530, chandrasekaran iyer wrote:
>>>>>> 
>>>>>>  Has anyone downgraded the PIC? how to do it? Which PICs are
>>>>>> supported by 6.1 release.
>>>>> 
>>>>> downgrade the PIC? What exactly do you want to achieve? And I'm more
>>>>> curious about why you would want to run JUNOS version that's EOLd over 5
>>>>> years ago?
>>>>> 
>>>>>  --Daniel.
>>>> 
>>>> I would also recommend against running a release as old as 6.1. There have
>>>> been numerous security updates since 6.1, and these are likely important to
>>>> your network. BTW, you don't downgrade PICs, you could change the release
>>>> to
>>>> an older version, in which case all the software for the system will be
>>>> downgraded.
>>>> 
>>>> Truman
>>>> 
>>>> _______________________________________________
>>>> juniper-nsp mailing list juniper-nsp at puck.nether.net
>>>> https://puck.nether.net/mailman/listinfo/juniper-nsp
>>>> 
>>> 
>>> 
>>> 
>>> --
>>> Thanks with regards
>>> 
>>> Shekar.B
>>> --
>>> 
>> 
>> 
>> 
>> --
>> Thanks with regards
>> 
>> Shekar.B
>> --
>> 
> 
>