[c-nsp] Re: [j-nsp] load balancing between multiple BGP links

[Harry Reynolds]

It was a gentleman named "economics"

 

> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net 
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Alok
> Sent: Thursday, September 15, 2005 10:52 AM
> To: Phillip Vandry
> Cc: juniper-nsp at puck.nether.net; Guy Davies
> Subject: Re: [c-nsp] Re: [j-nsp] load balancing between 
> multiple BGP links
> 
> Thanks folks for all your replies.
> 
> wonder who decided that the next commercially deployed link 
> capacity after a
> T1 should be a T3 and the next commercially deployed link 
> after a E1 should be an E3
> 
> :-)
> ----- Original Message -----
> From: "Phillip Vandry" <vandry at TZoNE.ORG>
> To: "Alok" <alokdube at hotpop.com>
> Cc: "Guy Davies" <Guy.Davies at telindus.co.uk>; "Joe Shen"
> <sj_hznm at yahoo.com.cn>; <juniper-nsp at puck.nether.net>; 
> <cisco-nsp at puck.nether.net>
> Sent: Thursday, September 15, 2005 11:15 PM
> Subject: Re: [c-nsp] Re: [j-nsp] load balancing between 
> multiple BGP links
> 
> 
> > On Wed, Sep 14, 2005 at 06:38:09PM +0530, Alok wrote:
> > > 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?
> >
> > I have not tried this, but if you can somehow treat link 2 
> as two links
> > and install two routes, then you can do equal cost load balancing
> > over link 1, link 2, and link 2 again. Options for doing that are
> > secondary IP addresses on each side of link 2 and a second static
> > route pointing to the secondary address on the other side (if using
> > static routes) or run link 2 as a trunk and put 2 vlans on it
> > (if using OSPF instead of static routes).
> >
> > This solution is only practical when the greatest common divisor of
> > the link sizes is large.
> >
> > -Phil
> >
> 
> 
> 
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