[c-nsp] ASR9k Bundle QoS in 6.0.1

Adam Vitkovsky Adam.Vitkovsky at gamma.co.uk
Wed Jun 1 05:45:48 EDT 2016

> Saku Ytti [mailto:saku at ytti.fi]
> Sent: Wednesday, May 18, 2016 2:31 PM
> On 18 May 2016 at 16:14, Adam Vitkovsky <Adam.Vitkovsky at gamma.co.uk>
> wrote:
> >> There isn't any central arbiter which is aware of all request/grants.
> > In contrary to TRIO, ASR9K actually has a central arbiter aware of all the
> access requests and grants.
> Are you sure about this? Where does it sit? You'd think arbiter sits in fabric
> card, responsible for requests/grants in THAT fabric. Having global view of all
> fabrics seems both expensive and unnecessary.
Hi Saku,

Got a confirmation from Xander, so in summary:
Each RP has 2 fabric chips, but both controlled by one common RSP Arbiter.
There are two RP cards in the chassis - so two Arbiters.
Only the Arbiter on the active RP controls all 4 fabrics.
However both Arbiters are getting the Fabric access requests in order to know exactly the whole state of the system at any given time so the failover can be instantenious.
There is no keepalive between the Arbiters but the RP's have a "CPLD" ASIC and one of its functions is to track the other RP's state via low level keepalives.


        Adam Vitkovsky
        IP Engineer

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