|
Posted by spork on June 10, 2006, 1:07 am
If you were Registered and logged in, you could reply and use other advanced thread options
Hi all,
I'm still mostly a n00b when it comes to OSPF, but I've been using it
in a fairly basic fashion for a number of years. I'm really stuck on
this one, since I have a similar config going on another router and
it's working as I'd expect it to.
Hardware/Software Details: 1721 w/12.3(11)T5 IP BASE software, one T1
WIC, one ADSL WIC
Goal: both the T1 and ADSL lines come back to the same 7206. The T1 is
frame converted to ATM at the dslam and long story short, that
conversion doesn't let me see if the T1 is up or down from the 7206
side, so I'm running OSPF. ADSL is a backup line. I want OSPF to
advertise the LAN block on the 1721 back to the 7206 and the 7206 to
advertise default to the 1721.
Problem: Both routers are in area 0, and both see each other as
neighbors. The 7206 has the 1721s loopback, serial ints and LAN ints
in it's OSPF db and routing table. The 1721 has routes (including
default) in the ospf db, but not in the routing table.
Brief config snippets from both:
7206:
router ospf 1
router-id 10.10.111.1
log-adjacency-changes
area 0 authentication message-digest
passive-interface default
no passive-interface ATM2/0.10246 <- ADSL
no passive-interface ATM2/0.10248 <- T1
no passive-interface ATM4/0.12655
no passive-interface FastEthernet5/0.1
network 10.10.104.0 0.0.0.255 area 0 <-T1 interface
network 10.10.110.0 0.0.0.255 area 0 <-ADSL interface
network 10.10.111.1 0.0.0.0 area 0
network 10.10.111.8 0.0.0.7 area 0
network 10.10.111.24 0.0.0.7 area 0
default-information originate always
!
1721:
router ospf 1
router-id 10.10.111.254
log-adjacency-changes
redistribute connected subnets
passive-interface default
no passive-interface ATM0.1
no passive-interface Serial0.1
network 10.10.104.248 0.0.0.0 area 0 <-T1 interface
network 10.10.108.16 0.0.0.15 area 0 <-LAN
network 10.10.110.10 0.0.0.0 area 0 <-ADSL interface
!
So no problems on the 7206 side, I see all the routes I need to see.
On the 1721 though:
Gateway of last resort is 0.0.0.0 to network 0.0.0.0
C 10.10.104.0/24 is directly connected, Serial0.1
10.10.111.0/32 is subnetted, 1 subnets
C 10.10.111.254 is directly connected, Loopback0
C 10.10.110.0/24 is directly connected, ATM0.1
10.10.108.0/28 is subnetted, 1 subnets
C 10.10.108.16 is directly connected, FastEthernet0
S* 0.0.0.0/0 is directly connected, Serial0.1
And if I drop that static default route, no ospf default route jumps in
to take it's place.
Here's the 1721 ospf database, you can see it's receiving a default:
Infinia#sh ip ospf database
OSPF Router with ID (10.10.111.254) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link
count
10.10.111.1 10.10.111.1 50 0x800016A8 0x001E53 9
10.10.111.3 10.10.111.3 1461 0x800030B0 0x00F546 18
10.10.111.254 10.10.111.254 629 0x80000012 0x00BB60 5
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 10.10.111.1 312 0x8000CC1B 0x00089D 1
10.10.111.254 10.10.111.254 629 0x80000002 0x003C1B 0
Infinia#
So what am I missing here? I have a few other sites with similar
configs and I have no problem getting a default route. In fact, other
than the IOS version on those, there's really no difference. Is this a
bug, or am I just not getting something fundamental here?
Thanks,
Charles
|
 
| |
Posted by Merv on June 10, 2006, 11:57 am
If you were Registered and logged in, you could reply and use other advanced thread options
OSPF message authentication is configured on 7206 but is not configured
on 1721.
For the OSPF process, "network 10.0.0.0 0.255.255.255 area 0" would
suffice.
Why is redistribute connected subnets command being used on 1721?
|
|
Posted by spork on June 10, 2006, 2:21 pm
If you were Registered and logged in, you could reply and use other advanced thread options
Merv wrote:
> OSPF message authentication is configured on 7206 but is not configured
> on 1721.
I must have missed it in the cut and paste - the routers are both using
md5 keys, and the session is up.
> For the OSPF process, "network 10.0.0.0 0.255.255.255 area 0" would
> suffice.
>
>
> Why is redistribute connected subnets command being used on 1721?
I am most interested in getting the LAN route back to the 7206.
Thanks,
Charles
|
|
Posted by Merv on June 10, 2006, 3:23 pm
If you were Registered and logged in, you could reply and use other advanced thread options
Post the 1721's OSPF database and routing table after the OSPF
authentication issue has been addressed.
Post the output of "show ip ospf database router" from the 1721.
|
|
Posted by Merv on June 10, 2006, 3:30 pm
If you were Registered and logged in, you could reply and use other advanced thread options
The "redistribute connected subnets" command maybe causing an issue
with the forwarding address as it is installing an external in the
1721's OSPF database
For testing purpose, pull that command.
|
| Similar Threads | Posted | | How do I remove routes from the OSPF RIF table ? | August 26, 2005, 11:20 am |
| How to avoid getting BGP routes while getting a router's routing table | January 24, 2006, 10:39 am |
| Influencing OSPF Routes | March 21, 2006, 8:07 pm |
| Routes received by BGP and OSPF | February 5, 2007, 11:48 am |
| OSPF and Static routes convergence | December 21, 2004, 11:16 pm |
| ospf and multiple static routes | August 4, 2006, 1:39 pm |
| OSPF O routes vs. redist connected (E2) | October 2, 2006, 12:01 pm |
| standby ASA doesn't learn ospf routes | May 30, 2007, 2:24 pm |
| OSPF external routes filtering between areas | March 21, 2006, 3:45 am |
| need routing table help please | July 25, 2004, 9:18 pm |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML site map