From: Ashot Hakobyan (ashot.hakobyan@xxxxxxxxxxxxxxxxx)
Date: Mon Apr 29 2002 - 22:38:22 GMT-3
Rizwan,
Configuring ospf on all interfaces and enabling the secondary link as a
backup to the primary should work. Namely, on each of the branch routers
configure:
interface serial 0 (primary to site A)
backup interface serial 1 (secondary to site B)
backup load 75 55
This will bring the secondary interface up once the load crosses 75%
threshold and ospf will establish neighbor relationship and install the
secondary link to the server farm in the routing table of the branch router
if the costs will be the same. To achieve that, you should configure the
cost of the primary link twice the cost of the secondary, because the
traffic has to cross two 2M links to reach the server farm through the
secondary link.
Ashot Hakobyan
Senior Consultant
NetTasking (ANZ) Pty Ltd
Tel: +61 2 9928 5725 Fax: +61 2 9439 1163
***** "Delivering Business Availability" *****
***** http://www.NetTasking.com *****
> -----Original Message-----
> From: Rizwan Afzal [mailto:rizwanafzal@softhome.net]
> Sent: Saturday, April 27, 2002 12:00 PM
> To: ccielab@groupstudy.com
> Subject: OSPF design recommendations
>
>
> Here is a network scenario. The customer wishes to run OSPF
> on the network and
> the design should meet his requirements...
>
> 2 Mbps
> -------------
> Server Farm ---- A 2 Mbps B
> -------------
> | | | |
> | | | |
> | | | |
> | | | | (all 2Mbps links)
> | | | |
> | | | |
> | | | |
> | | | |
>
> 1 2
>
> Description: A and B are two main sites with dual 2 Mbps
> links in between. All
> branch sites (1,2,3,4 and so on) have reundant 2 Mbps links
> to both A and B.
>
> Requirement: Sites 1 and 2 (branches) access the server farm
> at A through the
> direct 2 Mbps link. When this link is saturated to 75%, they
> should shift to
> the other 2 Mbps link and forward the traffic to the server
> farm through B.
>
> Is this somehow possible while running OSPF in the network???
> The customer
> does not want to run EIGRP or any other properiatary protocol.
>
> Any suggestions???
>
> Regards,
> Rizwan Afzal.
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