Re: [nsp] Load balancing with OSPF

From: Bruce R. Babcock (bbabcock@cisco.com)
Date: Fri Jul 10 1998 - 11:22:58 EDT


EIGRP

At 09:43 7/10/98 -0400, you wrote:
>To: cisco-nsp@qual.net
>cc: noc-backbone@forthnet.gr, vfyr@forthnet.gr
>Subject: Load Balancing and Backup with OSPF
>From: Vicky Fyrigou <vfyr@forthnet.gr>
>
>Hello all,
>
>We have tried to implement load balancing and backup, by using simply
>ospf on two links. In fact, we had 2 links of 64kbps on two routers
>with different networks on area 0. The links were of the same speed,
>thus the ospf cost was the same and the test worked just fine.
>Note that both interfaces had frame-relay encapsulation and we used
>>>sub-interfaces for the connections. All sub-interfaces had ospf
>network broadcast. We also used authentication for the area 0.
>
>The problems started when we tried to use the same scenario with 2
>lines of different speed: one of 64Kpbs and one of 128Kbps. I found
>from Cisco FAQ that Ospf will only load share if the paths are the same
>and that in order for Ospf to think that, you have to change the ospf
>cost on the interfaces. So I did (once I changed the ospf cost to the
>lowest speed -1562 on all interfaces and then I changed to the highest
>speed- 800 on all interfaces).
>
>The point is that load-sharing seemed to be working, but under full load
>the interface with the highest bandwidth would only work up to 64Kbps!
>
>What I could see from the ospf routes was that the traffic share count
>was 1 for both interfaces.
>
>Do you know whether there is a possibility to change somehow the traffic
>share count for the interfaces, or any other way to make this work?
>
>Thanks in advance,
>
>Regards,
>
>Vicky
>
>
>
>






This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:13:13 EDT