From: Simon Baxter (Simon.Baxter@xxxxxxxxxxxxxx)
Date: Sun Jul 30 2000 - 20:03:04 GMT-3
cheers.
-----Original Message-----
From: Aaron K. Dixon [mailto:adixon@smc.omnes.slb.com]
Sent: Monday, July 31, 2000 3:39 AM
To: Simon Baxter; ccielab@groupstudy.com
Subject: RE: OSPF Default Information
1. The ip default-network is used with distance vector protocols and not
OSPF. This is because IGRP doesn't advertise a 0.0.0.0 network.
2. OSPF and IS-IS don't automatically distributes a default route. You
must use the default information originate to redistribute a static default
route. If you want the router to create and redistribute a default route
whether you have one configured or not use the default information originate
always.
Regards,
Aaron K. Dixon
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Simon Baxter
Sent: Sunday, July 30, 2000 3:57 AM
To: ccielab@groupstudy.com
Subject: OSPF Default Information
Hello.
Can someone please tell me the rules with generating default information in
OSPF and which routes to mark as candidate defaults.
1) I only seem to be able to select a route which has an associated default
static route to that network, but the documentation states a non-default
network can be selected with the 'ip default-network' command. I've tried
it with OSPF learned routes which will appear in the route table (as below)
but won't pass on the default information to other OSPF routers.
2) Does the default-information originate have to be on an ABR?
RTRD#sh ip ro
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate
default
U - per-user static route, o - ODR
Gateway of last resort is 194.1.1.2 to network 193.1.1.0
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/65] via 194.1.1.2, 00:44:06, Serial1
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/65] via 195.1.1.2, 00:58:50, Serial0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/65] via 195.1.1.2, 00:58:50, Serial0
O N2 172.16.0.0/16 [110/50] via 194.1.1.2, 00:44:06, Serial1
O N2 172.18.0.0/16 [110/50] via 194.1.1.2, 00:44:06, Serial1
O* 193.1.1.0/24 [110/128] via 194.1.1.2, 00:44:06, Serial1
O N2 192.1.1.0/24 [110/10] via 194.1.1.2, 00:40:06, Serial1
C 195.1.1.0/24 is directly connected, Serial0
C 194.1.1.0/24 is directly connected, Serial1
RTRD#
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