[j-nsp] Unequal-Cost Load Balancing for OSPF

[Arda Balkanay]

OSPF only supports ECMP by design (Equal cost multipath).

If you need unequal cost load balancing without EIGRP you will need an MPLS
TE solution.
All Juniper boxes running Junos perfectly support MPLS TE with load
balancing.
use several LSP's from the same source to the same destination with
different bandwidths then see the loadbalance based on bandwith ratios that
you've specified.




On Thu, Nov 20, 2008 at 12:37 PM, Masood Ahmad Shah
<masood at nexlinx.net.pk>wrote:

> OSPFv2 does not support unequal-cost load balancing.
>
> Well, there is a way to do that; For example A customer have three E1's to
> a
> remote site.  Two are p-t-p and the other channel off of a E3.  When you
> add
> E3; EIGRP choose E3, ignoring the other two E1's.  Using the variance
> command you force EIGRP (Cisco) to utilize all three E1's.
>
> And now you could tune the OSPF metrics so that three paths would appear
> equal (as Farhan pointed out) or you could use RIP, assuming that the hop
> count to reach the destination on both links is the same. In either case
> you
> still have equal cost load balancing on two unequal links, which will
> result
> in wasted bandwidth at best and a bottleneck at worst.
>
> Regards,
> Masood
>
>
>
> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Farhan Jaffer
> Sent: Thursday, November 20, 2008 12:59 PM
> To: Iftikhar Ahmed
> Cc: juniper-nsp at puck.nether.net
> Subject: Re: [j-nsp] Unequal-Cost Load Balancing for OSPF
>
> No. And it's not Juniper, It is OSPF which does not support unequal cost
> load balancing.
>
> EIGRP supports this behavior by variance factor.
>
> If EIGRP is open atandard (not Cisco proprietry) then Juniper will also
> support the same feature for EIGRP.
>
> However you can use some tricks to justify your scenario.
>
>
> Farhan
>
>
>
> On Thu, Nov 20, 2008 at 12:44 PM, Iftikhar Ahmed
> <iftikhar.khan at gmail.com>wrote:
>
> > Hi,
> >
> >
> > Does Juniper support Unequal-Cost Load Balancing for OSPF, like the way
> > cisco do for EIGRP with commands like variance & maximum-paths etc stuff?
> >
> >
> >
> >
> > Regards
> > Iftikhar Ahmed
> > _______________________________________________
> > juniper-nsp mailing list juniper-nsp at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/juniper-nsp
> >
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