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

Adam Vitkovsky Adam.Vitkovsky at gamma.co.uk
Tue Mar 8 04:02:21 EST 2016

> James Bensley
> Sent: Monday, March 07, 2016 10:05 PM
> On 5 March 2016 at 22:25, Saku Ytti <saku at ytti.fi> wrote:
> > If you can rewrite the function run-time, then you can force linear
> > progression so if you want given fix on function Z, you also must walk
> > all the earlier changes in order until you're at that fix.
> Naturally.
> Going back to my waffle about erasing and re-installing routers, the order of
> operations in relation to patching becomes important. Unless you follow a
> linear code tree, forking off with different patches that can be installed
> independently of each other in no particular order, is asking for trouble.
> I have just today bottomed out another IOS-XR bug with the help of TAC and
> a BGP developer from China. An ASR9001 running BGP PIC and was originally
> 4.3.4 default which eventually received some custom SMUs to fix a bug when
> a line card was added, and then later patched up to
> SP10 to fix further issues had the CPU stuck between 50-60%, 24x7.
> A BGP SMU for a BGP DDTS fixing multiple BGP bugs which was applied to the
> router when one installs any 4.3.4 service pack from SP3 through to SP10
> included a bug-fix for BGP PIC, but this introduced a bug for us. PIC processes
> a best-external update indefinitely. The issue persists almost immediately
> after restarting the BPG process (as soon as an update comes through for a
> backup-path, which with the full Internet table takes no time at all basically)
> and immediately post reboot (for the same reason).
Well this sounds like a perfect example of a regression bug, when fix of one thing introduces another bug,
That's why I like to cherry pick SMUs related only to what I truly need to fix.
If the SP has a fix for e.g. BGP EVPN and I'm not using EVPN, then I'd rather omit that -because it can introduce bug in something that I actually do care about.


        Adam Vitkovsky
        IP Engineer

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