[j-nsp] maximum BGP multipath ECMP supported on M7i or M10i routers?

[Vitkovský Adam]

> if i started with pre flow 8 ecmp route to a single /32, later removed one
> route, would packets all be redistributed over 7 route? this would break in
> flight tcp sessions to the vip.

Well flows utilizing the failed path would be spread across the remaining 7 paths. 
But any particular flow would be using only a single path. 
So this would break the existing session only if different (per path) security/nat/balancer devices are crossed and states are nod synced among them. 
  

adam
> -----Original Message-----
> From: juniper-nsp [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf
> Of Yucong Sun
> Sent: Tuesday, April 01, 2014 10:08 AM
> To: krasi at smartcom.bg
> Cc: juniper-nsp at puck.nether.net
> Subject: Re: [j-nsp] maximum BGP multipath ECMP supported on M7i or
> M10i routers?
> 
> Thanks, do you have any insight on the consistent hashing?
> 
> if i started with pre flow 8 ecmp route to a single /32, later removed one
> route, would packets all be redistributed over 7 route? this would break in
> flight tcp sessions to the vip.
> 
> Cheers.
> 
> On Tuesday, April 1, 2014 12:59:50 AM, Krasimir Avramski
> <krasi at smartcom.bg>
> wrote:
> 
> Hi,
> 
> Two types of balancing supported: per prefix (bgp multipath) and per flow
> (ECMP next-hop including bgp multipath)
> 
> Up to 64 ECMP next-hops on MX(DPC, MPC), M120, M10i(Enhanced CFEB),
> M320( FPC dependent), T(FPC dependent) for RSVP, LDP, ISIS(ipv4/6),
> OSPF(ipv4/6), IBGP(ipv4/6), EBGP(ipv4/6).
> 
> Symmetric load
> balancing<http://www.juniper.net/techpubs/en_US/junos12.2/topics/usag
> e-guidelines/interfaces-configuring-symmetrical-load-balancing-lag-on-mx-
> routers.html>over
> 802.3ad link aggregation groups (LAGs) on MX routers with MPCs.
> 
> Best Regards,
> 
> Krasi
> 
> 
> On 31 March 2014 22:14, Yucong Sun <sunyucong at gmail.com> wrote:
> 
> Do anyone have in-sight on this?
> 
> More over, I guess my quest is to find a device that support
> 
> 1) per flow hashing with as many as ECMP route as possible.  (not sure how
> many ECMP route is supported)
> 2) consistent hashing (existing flow don't break if route is added or
> removed)   (juniper doc didn't mention this)
> 
> Your opinion/experience on this is greatly appreciated.
> 
> Thanks.
> 
> 
>   On Fri, Mar 28, 2014 at 12:44 PM, Yucong Sun <sunyucong at gmail.com>
> wrote:
> 
> > Hi,
> >
> > Does anyone know how many BGP multipath ECMP routes does a
> M7i/M10i
> > router support? 16? 32 ? 64?
> >
> > I found this document :
> >
> >
> >
> http://www.juniper.net/techpubs/en_US/junos13.3/topics/reference/confi
> guration-statement/maximum-ecmp-edit-chassis.html
> >
> > which says 16/32/64  but it was only mentioning MPLS routes, not BGP
> > multipath routes . I think they might be the samething, but just want
> > to be sure.
> >
> > Thanks!
> >
> 
> 
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