[j-nsp] Is there a noticeable performance difference between the RE-S-2000 and the RE-S-1800-X4 when rebuilding the FIB?

[Adam Vitkovsky]

Hello,
> v
> Sent: Thursday, February 25, 2016 9:00 AM
>
> Hello,
>
> let's assume a link goes down. The router (in our case a MX960) will have to
> rebuild the FIB in order to stop sending data to that interface.
>
> Is there a performance difference in such a case between the RE-S-2000 and
> the RE-S-1800-X4? How long does that process take for you? I know that with
> the smaller REs it can take ages. :)
>
I think the RE takes just a small part in the overall convergence time.
It is the part where LC CPU is pushing the SW FIB onto LU -one think is how fast you can read from a memory to perform a lookup and the other thing is how fast can you write information onto the memory.
But since the convergence time is not linear I believe there's some problem with buffer overflow dropped information and necessary retransmission when a lot of information needs to be programed at once
-that is if you measure convergence for 2M prefixes and divide the time by 2M to calculate convergence for one prefix you will get a much higher number than you get when you actually measure convergence for 1 prefix.


adam














        Adam Vitkovsky
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