[j-nsp] juniper router reccomendations

[Adam Vitkovsky]

> Saku Ytti
> Sent: Saturday, July 30, 2016 11:48 PM
>
> This is all great. But I think either message customers send is misunderstood
> or correct fix is hard.
>
> Our main complain isn't that it takes long time to program FIB. Our complain is
> that delta between software being updated and hardware being updated is
> too large. All the investments into redundancy are rendered useless when
> software starts sucking in traffic before it can forward it.
>
> HW and SW update times should be coupled. Of course fast FIB update is
> great and welcome, but it's far more important not to blackhole.
>
Now I have realized that there might be a problem which BGP PIC can't really solve.
And that's when the primary edge link/PE comes back online advertises it's prefixes to the rest of the AS and ingress PEs will actually install and start using these, sending traffic to egress PE sooner than it can actually forward it cause it's FIB is still being updated.
And for this specific case what you describe would be needed.

So essentially you're suggesting holding up BGP updates to peers until the router has it's FIB fully populated right?
I think that might be easier said than done, there would have to be a correlation between Protocol to RIB update job ID and RIB to FIB update job ID, so that each FIB update job is traceable back to the protocol which initiated it. Now what would constitute the job, single pfx a bulk of pfxes?

Anyways, till the triggered approach is implemented I think you can slow down iBGP update generation with the "out-delay" knob.
It's not as clear of a cut as with csco's "neighbor advertisement-interval" but looks like it can do the same thing.
https://kb.juniper.net/InfoCenter/index?page=content&id=KB26446&actp=search


adam









        Adam Vitkovsky
        IP Engineer

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

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