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PLATFORM-DIAGS-3-PUNT_FABRIC_DATA_PATH_FAILED

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Mon, 05/12/2014 - 06:03
Sep 13th, 2013
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We see a spike in requests for RMA's when this particular message is seen.

Fortunately 99% of the time this is not caused by hardware issues.

I came to realize this is a difficult topic and you probably want to know what causes it, or how it works.

The following document tries to provide some explanations, operation and mitigations when this particular problem is seen.

A most recent reason was uncovered and documented by CSCuj10837 (fix and RNE to be provided).

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xthuijs Mon, 05/05/2014 - 05:02
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Hi VV,

a smu for 420 is not planned. (nor for 421). in XR 42 release, you probably want to be at the 423 release.

But if you're considering upgrade, our recommended release is XR 4.3.4

regards

xander

vivekvashist Mon, 05/05/2014 - 18:37
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Hi xander,

Thank you very much for your prompt response - really appreciate it.

Cheers,

VV 

xthuijs Mon, 05/12/2014 - 05:02
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hi vivek,

that is the right reference for the upgrade instructions.

from 420 there is little acceleration that we can provide unfortunately. however starting 423 and onwards you have a lot of tools extra in the pocket such as the auto fpd update (basically the fpd's are updated on the new release while running the existing release so that only a single reload is required)

in XR 43 there are various additional install improvements too.

So unfortunately from 420 -> next is a bit painful, but forward from there things will be a lot better and easier!

regards

xander

vivekvashist Mon, 05/12/2014 - 05:16
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Thanks Xander for you thoughts. 

Couple of more questions - 

- Would you recommend doings smu's or clean install to 4.3.4 using turboboot ?   

- Boxes we have are in international pop's with no onsite staff to assist if things go haywire - do have any tips in such scenarios? 

- Also, with turboboot - tftp seems to be the only option, which is quite slow - any other recommendations? 

- Also, i was thinking of upgrading a spare A9K-RSP-4G to 4.3.4 and put config and just swapping out with one in field - would the second RSP be upgraded automatically and does this option seem feasible?

Sorry about so many questions and thanks for all your assistance. 

Cheers,
​VV  

 

 

 

xthuijs Mon, 05/12/2014 - 05:22
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hey vivek;

of all the options you have turboboot is indeed the slowest, but going form 420 might be the best option, but with that a few suggestions:

1) if you have RSP440 use the USB to turboboot from.

2) if you have to use TFTP, eg when you have the RSP2; set the TFTP_BLK_SIZE to 1450

3) disable the watchdog with priv and then diswd from rommon prompt

4) take out the existing standby RSP, upgrade that via any of the methods above and then during the maintenance window take out the active RSP, insert the newly offline upgraded RSP to boot the system with, when it runs smooth, insert the old active running old version which will get sync'd to the new RSP's version automatically. (FPD's for linecards and old-ver running RP still need to be done!)

Those are probably the least painful to pursue and the shortest downtime.

Also tkae into consideration that when you are running the right version to execute the:

run repart -d from the XR cli prompt to reclaim the 300M reserved space on the disk0/1.

(this can be doen inline and doesnt require downtime or reload)

regards!

xander

vivekvashist Mon, 05/12/2014 - 05:35
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Hi Xander,

 

Thanks again - that was quick :) 

I will look at option 4 deeper - which appears less painful - do you have step by step page/doco you can point me to ?

-VV 

xthuijs Mon, 05/12/2014 - 05:39
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you caught me at a good time Vivek :)

as for the offline upgrade of the now standby RSP, it is basically firing it up in a chassis and follow the procedure as per doc you have, there is no magic to it from a technical perspective, other then the manual effort of pulling it out, inserting it some place else, upgrade it and getting ready to put it back in as primary RP for the chassis that needs to be ugpraded.

regards

xander

xthuijs Mon, 05/12/2014 - 06:03
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haha!! nice :) yeah both work for me :)

cheers Vivek!

xander

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