[c-nsp] Cisco Router IRB

James Bensley jwbensley at gmail.com
Mon Mar 5 04:45:07 EST 2018


On 5 March 2018 at 08:42, Mikael Abrahamsson <swmike at swm.pp.se> wrote:
> On Mon, 5 Mar 2018, Arie Vayner wrote:
>
>> My gut feeling tells me the performance will be the same for irb and
>> regular routing. These are software routers, so the performance depends on
>> how many and which features you enable.
>
>
> There is a huge performance difference (at least in older routers and older
> software) between CEF-enabled forwarding paths and non-CEF-enabled
> forwarding paths, even on CPU based routers.
>
> Look for routerperformance.pdf and compare "process switching" and "fast/CEF
> switching". There is often 5-20x difference in pps. So at least back then it
> was important to use features that were CEF enabled, otherwise performance
> would go down a lot.

I thought that IRB did use CEF on the ISR-G2s?

Cheers,
James.


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