Re: ospf-- default-information originate vs redist static [7:42294] posted 04/23/2002
- Subject: Re: ospf-- default-information originate vs redist static [7:42294]
- From: "bergenpeak" <bergenpeak@xxxxxxxxxxxxx>
- Date: Mon, 22 Apr 2002 23:10:55 -0400
Here's what I did:
1) Configured OSPF between a number of routers. Verified
all where seeing routes via OSPF.
2) Made the following config additions:
ip route 0.0.0.0 0.0.0.0 a.b.c.d
ip route 18.104.22.168 255.255.255.255 a.b.c.d
router ospf 100
redistribute static subnets
where a.b.c.d is a valid next-hop
then did a show ip route on the other ospf routers. None show
the default route but all show an E2 22.214.171.124/32 route.
3) Removed the "redistribute static subnets". Did a
show ip route on the other routers. The 126.96.36.199/32
4) Added a "default-information originate". Did a show
ip route on the other OSPF routers and the 0/0 default appears
as an E2 route.
Cisco doesn't (apparently) treat a 0/0 route as a real route/subnet.
instance, suppose you have a default route defined on a router. Then
do a "show ip route 188.8.131.52". If you don't have a prefix which
covers this subnet, one might expect it to report the 0/0
resultant route. IMO, this is what it should do. It instead shows a
"network not in table" error.
Audy Bautista wrote:
> The other day, I simulated the same sceanario but I got opposite results.
> When I first added the "default-information originate" after I added a
> default router (ip route 0.0.0.0 .0.0.0.0 a.b.c.d), the default route did
> not propagate through my OSPF network. But, when I took of that statement
> and added the "restribute static subnets" statement, it propagated
> Did you add a static default route (ip route 0.0.0.0 .0.0.0.0 a.b.c.d)
> before you tried the "default-information originate" statement?
> ""bergenpeak"" wrote in message
> > Trying to understand OSPF behavior when generating a default
> > route.
> > If I do a "default-information originate" in OSPF, I see a
> > E2 0/0 route on all other OSPF routers. Ok, I understand this.
> > If I instead define a static default route
> > "ip route 0.0.0.0 0.0.0.0 a.b.c.d" and then in my OSPF
> > setup do a "redistribute static subnets" (and not the
> > default information originate), then the other routers
> > do not see a 0/0 route.
> > Why?
> > THanks
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