[j-nsp] ISSU

[andy]

On Mon, Mar 29, 2010 at 06:00:35PM +0530, chandrasekaran iyer wrote:
> hi,
> 
>    how to do iSSU in junos? Can anybody provide me the steps.
> 

A unified in-service software upgrade (unified ISSU) enables you to upgrade between two different JUNOS software releases with no disruption on the control plane and with 
minimal disruption of traffic. Unified ISSU is only supported on dual Routing Engine platforms. In addition, the graceful Routing Engine switchover (GRES) and nonstop 
active routing (NSR) must be enabled.

To do this you need:

[edit system]
+   commit synchronize;
[edit chassis]
+   redundancy {
+       graceful-switchover;
+   }
[edit routing-options]
+  nonstop-routing;

Then....

1.	Verify that both routing engines are running the same version of software code. Use the ‘show version invoke-on all-routing-engines’ command.
2.	Enable Graceful Routing Engine switchover and non-stop active routing. Verify that the Routing Engines and protocols are synchronized. 
	On the backup Routing Engine (re1) run the ‘show system switchover’ command.
3.	To verify non-stop active routing is configured. On the master Routing Engine (re0) run the ‘show task replication’ command.
4.	Issue the request system software in-service-upgrade command on the master Routing Engine. Run the ‘request system software in-service-upgrade <path-to-image> reboot’ 
	command. Make sure you replace the "<path-to-image>" with the correct image version to be used in the upgrade.
5.	The upgrade will take place for both routing-engines whilst in service.


Cheers

-- 
andy    andy at shady.org
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Never argue with an idiot. They drag you down 
to their level, then beat you with experience.

CCIP, JNCIP #959
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