[c-nsp] ASR9k Bundle QoS in 6.0.1

[Adam Vitkovsky]

> 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







        Adam Vitkovsky
        IP Engineer

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

This is an email from Gamma Telecom Ltd, trading as “Gamma”. The contents of this email are confidential to the ordinary user of the email address to which it was addressed. This email is not intended to create any legal relationship. No one else may place any reliance upon it, or copy or forward all or any of it in any form (unless otherwise notified). If you receive this email in error, please accept our apologies, we would be obliged if you would telephone our postmaster on +44 (0) 808 178 9652 or email postmaster at gamma.co.uk

Gamma Telecom Limited, a company incorporated in England and Wales, with limited liability, with registered number 04340834, and whose registered office is at 5 Fleet Place London EC4M 7RD and whose principal place of business is at Kings House, Kings Road West, Newbury, Berkshire, RG14 5BY.
---------------------------------------------------------------------------------------
 This email has been scanned for email related threats and delivered safely by Mimecast.
 For more information please visit http://www.mimecast.com
---------------------------------------------------------------------------------------