[j-nsp] Multi Core on JUNOS?
philxor at gmail.com
Thu Oct 8 17:36:04 EDT 2015
Timos (now SROS) is all internal, no config knobs I am aware of, but the whole system was built to be multithreaded from the beginning. Their vRR implementation is very fast because it can distribute the neighbor sessions across multiple cores. If you look at the vRR stuff they have put out there are some more details.
From: "Adam Vitkovsky" <Adam.Vitkovsky at gamma.co.uk>
Sent: 10/8/2015 3:55 PM
To: "Saku Ytti" <saku at ytti.fi>; "Colton Conor" <colton.conor at gmail.com>
Cc: "juniper-nsp at puck.nether.net" <juniper-nsp at puck.nether.net>
Subject: Re: [j-nsp] Multi Core on JUNOS?
> Of Saku Ytti
> Sent: Thursday, October 08, 2015 5:34 PM
> TimOS has been able to distribute work from BGP to many cores, as far as I
> know all other vendors will only ever use one core for BGP at given time.
Actually IOS XR "had" the capability to run BGP in a standalone or distributed mode on CRS (found a comment that on 4.2.0 the "bgp distributed speaker" config was removed).
-in distributed mode up to 15 BGP speaker process could be offloaded to DRPs -even in different nodes (multi-chassis) and you can assign peers to different speaker processes.
-but there are some drawbacks during best path selection algorithm because only the partial best paths for a local speaker process are stored into dRIB that is then shared via IPC between the different speaker processes.
-and also some restrictions on how AFs can be distributed across the speaker processes but it's worth nothing that in case of a failure of one process/AF the other AFs are intact.
The other "current" possibility on XR is to run Multi-Instance BGP.
In this mode each BGP instance (max 4) is a completely separate set of processes running on the same or different RP or DRP the processes don’t share any RIB so no need for distributed adj-rib-in.
If required each instance can have a different AS number.
I'm not familiar with TimOS (other than reviewing the config guide) so I'd be interested to see what options are there.
T: 0333 006 5936
E: Adam.Vitkovsky at gamma.co.uk
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