[j-nsp] OSPF Metric in Juniper.

brad dreisbach bradd at eng.verio.net
Wed Jan 21 05:24:45 EST 2004


On Wed, Jan 21, 2004 at 11:24:59AM +0100, Lars Erik Gullerud wrote:
> On Wed, 2004-01-21 at 11:04, Milind Deshpande wrote:
> 
> [snip]
> > When we issue ping from Router A to Router D, ideally as per OSPF metric
> > which is cost, it should follow the "Router B & Router D" path, but it is
> > following "Router C & Router D"
> > What could be the reason of taking path which are having both STM1 links,
> > instead of Gigabit & STM1 path?
> 
> Unless you have increased the OSPF reference bandwidth in your network
> or manually assigned metrics to interfaces, anything >= 100Mbit has a
> metric of 1 (100Mbit is the default reference-bandwidth for OSPF cost
> calculation). Which means A-C-D and A-B-D are equal-cost paths (same
> number of hops, all hops are metric 1). Then  router A will load-balance
> between the two, a "show route <ip of D>" should show you both paths.

yea you'd think traffic would be load balanced...according to this anyways:
http://www.juniper.net/techpubs/software/junos/junos61/swconfig61-routing/html/ospf-config17.html#1014485

i wonder what effect having traffic-engineering shortcuts enabled
will have though.hmmmm...

-b

> 
> /leg
> 
> 
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