[149093] in North American Network Operators' Group

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Re: juniper mx80 vs cisco asr 1000

daemon@ATHENA.MIT.EDU (Mark Tinka)
Sat Jan 28 00:39:38 2012

From: Mark Tinka <mtinka@globaltransit.net>
To: nanog@nanog.org
Date: Sat, 28 Jan 2012 13:38:57 +0800
In-Reply-To: <596B74B410EE6B4CA8A30C3AF1A155EA09C92BD6@RWC-MBX1.corp.seven.com>
Reply-To: mtinka@globaltransit.net
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org

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On Thursday, January 26, 2012 02:57:59 AM George Bonser=20
wrote:

> If there is a hardware change, you might need to update
> the FPGA images. That is a second file but doesn't
> happen with every release.  In fact, you might not even
> need it of they DO release a new one because the change
> might be for the addition of FPGA images or changes to
> an image for blade you don't even have. But again, it is
> one combined file for all blades.

The issue we have now with IOS XR-based systems is the=20
SMU's. Most times, the SMU's need to reload bits of the=20
hardware, and it will be different files making different=20
updates that each need to reload bits of the hardware=20
(fabric, line cards, e.t.c.).

Needless to say, a software upgrade of the main OS on IOS XR=20
systems is very lengthy. I'm yet to do it in less than one=20
hour, particularly if you're doing SMU's at the same time.=20
Here, Junos wins (although, in all fairness, the systems=20
aren't the same so maybe not a proper comparison to begin=20
with).

But I understand Cisco are working on streamlining this in=20
future releases of IOS XR, which would be welcome. While I=20
prefer SMU's to ISSU, the majority of them are not entirely=20
hitless (contrary to the documentation accompanying an SMU),=20
although it will take a shorter time to update via an SMU=20
than the main OS, as of today anyway.

Mark.

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