From: Ryan Hoffman (ryan.hoffman@xxxxxxxxx)
Date: Tue Sep 12 2000 - 09:47:58 GMT-3
Sorry for the delay. Moved on to other configuration. Now returning to
this one, I can't reproduce it. r10 can see r9's default w/o advertising
his RID network.
r10
===
ip subnet-zero
ip classless
!
interface Loopback0
ip address 192.168.5.1 255.255.255.128
no logging event subif-link-status
!
interface Ethernet0
ip address 192.168.2.2 255.255.255.128
no logging event subif-link-status
!
router ospf 1
network 192.168.2.0 0.0.0.255 area 0
r9
==
ip subnet-zero
ip classless
!
interface Loopback0
ip address 192.168.1.129 255.255.255.128
!
interface Loopback1
ip address 192.168.0.129 255.255.255.128
ip ospf network point-to-point
!
interface Ethernet0
ip address 192.168.0.1 255.255.255.128
!
router ospf 2
network 192.168.0.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 0
default-information originate always
r11
===
ip subnet-zero
ip classless
!
interface Loopback0
ip address 192.168.1.1 255.255.255.128
!
interface Ethernet0
ip address 192.168.2.1 255.255.255.128
media-type 10BaseT
!
interface Ethernet1
ip address 192.168.0.2 255.255.255.128
no ip split-horizon
media-type 10BaseT
!
router ospf 2
network 192.168.0.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 0
network 192.168.2.0 0.0.0.255 area 0
As for both r9 and r11 having 'default-information originate', I wanted to
see how OSPF behaves with competing default routes. Both r9 and r10 send a
default to r11. r11 sees both, equal cost. For some reason I don't see
r9's dfr in r11's routing table, not vice versa. Removing the
'default-information originate always' fixes this.
Anyone know how to get ospf default routes in all?
-----Original Message-----
From: Geatti [mailto:geatti@home.com]
Sent: Thursday, September 07, 2000 10:00 AM
To: Ryan Hoffman; 'gs'
Subject: RE: OSPF Router ID not advertised, causing problems
Ryan, please post configs for all 3 routers so we have a little more info.
If you are advertising a default from R9 why are you also using a default
from R10? Is this intentional for scenario purposes? The RID does not need
to be in the routing process, it's just used as an ID never as an address
for things like a next hop. Post your configs and we'll figure it out, there
is some other issue here.
Looks to me like you have overlapping address space that may be causing some
problems.
Marco
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Ryan Hoffman
Sent: Thursday, September 07, 2000 10:00 AM
To: 'gs'
Subject: OSPF Router ID not advertised, causing problems
What are the consequences of not advertising your RID network in ospf? See
the following cfg below. r9 is providing an EX2 default route. r11 sees
it, r10 doesn't. It's in the database, however, ready to use.
e0 e1 e0 e0
2514 ----- 4000 ----- 2514
r9 r11 r10
- all one ospf process
r10
===
ip subnet-zero
!
interface Loopback0
ip address 192.168.5.1 255.255.255.0
no logging event subif-link-status
!
interface Ethernet0
ip address 192.168.2.2 255.255.255.128
no logging event subif-link-status
!
router ospf 1
network 192.168.2.0 0.0.0.127 area 0
default-information originate always metric 10
!
ip classless
r10#sh ip route
Gateway of last resort is not set
192.168.0.0/25 is subnetted, 2 subnets
O 192.168.0.0 [110/20] via 192.168.2.1, 00:01:55, Ethernet0
O IA 192.168.0.128 [110/21] via 192.168.2.1, 00:01:55, Ethernet0
O IA 192.168.1.0/24 [110/21] via 192.168.2.1, 00:01:55, Ethernet0
192.168.2.0/25 is subnetted, 1 subnets
C 192.168.2.0 is directly connected, Ethernet0
C 192.168.5.0/24 is directly connected, Loopback0
r10#sh ip ospf data external
OSPF Router with ID (192.168.5.1) (Process ID 1)
Type-5 AS External Link States
LS age: 149
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 0.0.0.0 (External Network Number )
Advertising Router: 192.168.0.129
LS Seq Number: 80000035
Checksum: 0xD9B7
Length: 36
Network Mask: /0
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 2
Forward Address: 0.0.0.0
External Route Tag: 2
LS age: 164
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 0.0.0.0 (External Network Number )
Advertising Router: 192.168.5.1
LS Seq Number: 80000001
Checksum: 0x60D9
Length: 36
Network Mask: /0
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 10
Forward Address: 0.0.0.0
External Route Tag: 1
Advertising 192.168.5.1 out fixes this. If I add 'network 192.168.5.1
0.0.0.0 area 0' to r10's 'router ospf 1' I get the following...
r11#sh ip route
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 192.168.0.1 to network 0.0.0.0
192.168.0.0/25 is subnetted, 2 subnets
C 192.168.0.0 is directly connected, Ethernet1
O IA 192.168.0.128 [110/11] via 192.168.0.1, 00:00:11, Ethernet1
O IA 192.168.1.0/24 [110/11] via 192.168.0.1, 00:00:11, Ethernet1
192.168.2.0/25 is subnetted, 1 subnets
C 192.168.2.0 is directly connected, Ethernet0
192.168.5.0/32 is subnetted, 1 subnets
O 192.168.5.1 [110/11] via 192.168.2.2, 00:00:11, Ethernet0
O*E2 0.0.0.0/0 [110/2] via 192.168.0.1, 00:00:11, Ethernet1
r10#sh ip ospf database ex
OSPF Router with ID (192.168.5.1) (Process ID 1)
Type-5 AS External Link States
LS age: 852
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 0.0.0.0 (External Network Number )
Advertising Router: 192.168.0.129
LS Seq Number: 80000035
Checksum: 0xD9B7
Length: 36
Network Mask: /0
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 2
Forward Address: 0.0.0.0
External Route Tag: 2
LS age: 867
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 0.0.0.0 (External Network Number )
Advertising Router: 192.168.5.1
LS Seq Number: 80000001
Checksum: 0x60D9
Length: 36
Network Mask: /0
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 10
Forward Address: 0.0.0.0
External Route Tag: 1
Why does r10 behave this way, and only for this EX2 route?
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