From: Ronny Jonathan (rjonathan@hotpop.com)
Date: Fri Oct 25 2002 - 10:41:22 GMT-3
Hi Hunt,
If you use multipoint sub-interface or physical interface, both will have
default
ospf network type: non broadcast. If the requirement is you can't use
neighbor command,
you should change the ospf network type to either broadcast or multipoint.
if you use ospf network type broadcast and the frame-relay network is not
fully meshed,
you must ensure the HUB as the DR. As for the multipoint network type you
don't need
to have any DR. IOS will treat the frame-relay network as multiple
point-to-point network. That's
why you get the /32 routes.
Either you use broadcast, non-broadcast, or multipoint, you don't need to
specify multiple
frame-relay map on the spoke to point to other spokes. You only need to
point to the hub.
OSPF adjacencies won't be established between spokes, because they don't
have direct
physical connection w/ each other.
Hope that help !
Thanks.
Ronny
----- Original Message -----
From: "Hunt Lee" <ciscoforme3@yahoo.com.au>
To: <ccielab@groupstudy.com>
Sent: Friday, October 25, 2002 8:22 PM
Subject: Help Help!!
> Hello,
>
>
> A
> /|\r
> B C D
>
> A - 172.16.2.1/24
> B - 172.16.2.2/24
> C - 172.16.2.3/24
> D - 172.16.2.4/24
>
> I have to subj fo clarificationj:
>
> If the Lab requirements: Don't use ospf neighbors command and we have
> FR cloud as the same one subnet, we have two choices using multipoint
> sub-interface or physical interface:
>
> 1) to use "ip ospf network brodcast" - drawback is that we have to put
> "ip ospf priority 0" under interfaces on spokes to force HUB to be DR.
>
> 2) if use multipoint sub-interface, unlike with physical interface
> method above, each spoke only need a "frame-relay map ip" statement
> pointing back to the HUB, & don't need any additional map statement to
> point to the other spokes, why??
>
> And on the spoke's RT, I now picked up a bunch of /32 routes from other
> spokes... where do they come from??
>
> Gateway of last resort is not set
>
> 1.0.0.0/32 is subnetted, 1 subnets
> O IA 1.1.1.1 [110/65] via 172.16.2.1, 00:00:23, Serial0
> 2.0.0.0/32 is subnetted, 1 subnets
> C 2.2.2.2 is directly connected, Loopback0
> 3.0.0.0/32 is subnetted, 1 subnets
> O IA 3.3.3.3 [110/129] via 172.16.2.1, 00:00:23, Serial0
> 4.0.0.0/32 is subnetted, 1 subnets
> O IA 4.4.4.4 [110/129] via 172.16.2.1, 00:00:23, Serial0
> 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
> O 172.16.2.4/32 [110/128] via 172.16.2.1, 00:00:23, Serial0
> O 172.16.2.3/32 [110/128] via 172.16.2.1, 00:00:24, Serial0
> C 172.16.2.0/24 is directly connected, Serial0
> O 172.16.2.1/32 [110/64] via 172.16.2.1, 00:00:24, Serial0
> RTB#
>
> Please add something or disprove if I'm wrong.
>
> Thank you,
>
> Hunt
>
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This archive was generated by hypermail 2.1.4 : Tue Nov 05 2002 - 08:35:56 GMT-3