[j-nsp] load balancing between multiple BGP links

[Harry Reynolds]

I think this is per-session, per-directly attached link.  You will need
to EBGP sessions with each advertising the BW associated with its
directly connected EBGP peering link.

Regards


> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net 
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Alok
> Sent: Wednesday, September 14, 2005 8:45 AM
> To: juniper-nsp at puck.nether.net
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [j-nsp] load balancing between multiple BGP links
> 
> thanks folks,
> 
> Any one knows if the "link bandwidth" can be set to 2 
> different values for 1 BGP session?
> 
> In other words how is it different from simply tracking the 
> link util on each of the 2 ECMP routes and sending the 
> packet/setup the flow based on the instant value
> 
> It would work for non BGP ECMP scenarios too...right? (2 
> links of unequal costs but to the same peer and simply 
> schedule cells based on the util
> value)
> 
> -thanks
> Alok
> 
> ----- Original Message -----
> From: "Harry Reynolds" <harry at juniper.net>
> To: "Alok" <alokdube at hotpop.com>; "Guy Davies" 
> <Guy.Davies at telindus.co.uk>; "Joe Shen" 
> <sj_hznm at yahoo.com.cn>; <juniper-nsp at puck.nether.net>
> Cc: <cisco-nsp at puck.nether.net>
> Sent: Wednesday, September 14, 2005 7:19 PM
> Subject: RE: [j-nsp] load balancing between multiple BGP links
> 
> 
> The link bandwidth community, as of 5.6, should balance accordingly:
> 
> 
> http://www.juniper.net/techpubs/software/junos/junos56/rn-sw-5
6/html/rn-
> sw-563.html#1130062
> 
> BGP multipath link-bandwidth attribute--When per-packet load-balancing
> is enabled, you can specify bandwidth values resulting in unequally
> distributed traffic when you set up a community policy for 
> BGP multipath
> path selection. By default, when you use BGP multipath, the router
> distributes traffic equally among the several paths it calculates. To
> configure an unequal distribution, include the bandwidth attribute,
> specifying the local autonomous system and link bandwidth in bytes per
> second, at the [edit policy-options community name] hierarchy 
> level. The
> show route detail and show route forwarding-table commands display the
> new output. [Policy, Command Reference]
> 
> HTHs
> 
> > -----Original Message-----
> > From: juniper-nsp-bounces at puck.nether.net
> > [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Alok
> > Sent: Wednesday, September 14, 2005 6:08 AM
> > To: Guy Davies; Joe Shen; juniper-nsp at puck.nether.net
> > Cc: cisco-nsp at puck.nether.net
> > Subject: Re: [j-nsp] load balancing between multiple BGP links
> >
> >
> > ----- Original Message -----
> > From: "Guy Davies" <Guy.Davies at telindus.co.uk>
> > To: "Joe Shen" <sj_hznm at yahoo.com.cn>; <juniper-nsp at puck.nether.net>
> > Cc: <cisco-nsp at puck.nether.net>
> > Sent: Wednesday, September 14, 2005 4:20 PM
> > Subject: RE: [j-nsp] load balancing between multiple BGP links
> >
> >
> > > Hi Joe,
> > >
> > > It can't with the physical layout you described.  BGP
> > selects one next-hop
> > as the best (and only one).  The only way to load share is to
> > have two (or
> > more) parallel links between just two routers.  You then
> > create a static
> > route on each end via each physical next-hop to the loopback
> > on the far end
> > router.  Then, you setup an ebgp multihop session between the
> > loopbacks on
> > the two routers.  That then uses IGP load sharing to balance
> > traffic across
> > the two parallel links.
> > >
> >
> > Anyone knows what to expect in this scenario?
> >
> > R1===========R2
> >
> > EBGP multihop between them over 2 links
> > link 1 =10Mbps
> > link 2 = 20 Mbps
> >
> > total traffic = 25Mbps
> >
> > Is there a way to ensure that link 1 doesnt get choked?
> >
> >
> > -thanks
> > Alok
> >
> >
> >
> > _______________________________________________
> > juniper-nsp mailing list juniper-nsp at puck.nether.net
> > http://puck.nether.net/mailman/listinfo/juniper-nsp
> >
> 
> 
> 
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> http://puck.nether.net/mailman/listinfo/juniper-nsp
>