ospf cost and route selection (openospfd)

Eygene Ryabinkin rea-fbsd at codelabs.ru
Wed Feb 6 07:40:09 PST 2008


Josef, good day.

Currently I can not answer your question, sorry.  I just have the
remark.

Wed, Feb 06, 2008 at 03:41:04PM +0100, Josef Pojsl wrote:
> ospfctl show rib:
> Router 1:
> Destination          Nexthop           Path Type    Type      Cost    Uptime  
> 0.0.0.2              10.31.2.2         Intra-Area   Router    20      00:03:51
> 10.30.1.2/32         10.31.2.2         Intra-Area   Network   40      00:03:41
> 10.31.1.2/32         10.31.2.2         Intra-Area   Network   70      00:03:51

'Cost' column looks perfectly correct: in order to reach the other
router, the path with cost 20 is selected (presumably, WAN X); path
to 10.30.1.2/32 costs 20+20: 20 from WAN X interface and 20 from
the gre30 on the other end; and path to 10.31 costs 70=20+50,
WAN X + gre31 on the other end.

The only weird thing is the nexthop value.  Your 'netstat -rn' shows
routes via gre31 too?  If yes, maybe the verbose mode of the openospfd
(-v) will show something interesting?
-- 
Eygene


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