[c-nsp] NCS-5001 - MPLS L3VPN Issue

Adam Vitkovsky Adam.Vitkovsky at gamma.co.uk
Tue Mar 1 08:11:03 EST 2016

> Gert Doering
> Sent: Tuesday, March 01, 2016 12:16 PM
> Hi,
> On Tue, Mar 01, 2016 at 11:21:11AM +0000, Phil Mayers wrote:
> > Upgrades != Fresh installs, unless the OS is a complete,
> > self-contained, read-only image, with the only mutable state being
> > config applied to the ramdisk *after* boot ;o)
> True, and that's actually an option I'd love to see for XR.
> Possibly similar to what OpenWRT does.
> "Here, take this immutable file system image, and mount this *other* file
> system image read/write on top of it (overlayfs)"
> So you can always see exactly which files got modified, and potentially undo
> everything ("rm -rf /overlay/*").  Patches get installed to the overlay file
> system, major upgrades replace /rom/ with a new base image and clean the
> /overlay/ filesystem of everything that is not a recognized config file.
> But of course this is all hobbyist stuff, not something a professional software
> engineering company like Cisco would ever consider.  Right?
> gert
Hi Gert,

I think the approach that vendors are heading towards is to have multiple VMs.
So VM hosting one XR version and another VM hosting another XR version and then you just switch from one to other
And since the nPower X1e allows for two micro codes to be loaded in parallel the upgrade process is with no packet/topology loss
 -so far this is available only on NCS6K since XR5.0 but the plans are to introduce this to ASR9k and other platforms as well.


        Adam Vitkovsky
        IP Engineer

T:      0333 006 5936
E:      Adam.Vitkovsky at gamma.co.uk
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