I think you may be mixing two different tasks (13 and 14)
To make this go away try making the fa0/1 interface passive on R8
Router ospf 2
Passive-interface fa0/1
That should take care of the %OSPF error
Verify the output of the "show ip interface ospf brief" command, neighbor
should be in EXSTART if you have an MTU mismatch.
To view the MTU on the interfaces of a routers use the following command
Router#sh int fa0/1 | in MTU
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
On your Cat3 and Cat4 disable the MTU on the fa0/21 (Cat3) and the fa0/19 (Cat4)
That should do it!
From: [email protected]
[mailto:[email protected]] On Behalf Of Jay McMickle
Sent: Tuesday, August 24, 2010 6:58 PM
To: [email protected]
Subject: [OSL | CCIE_RS] WB1- Task 10.13
When configuring the OSPF section, I get the error about mismatch area:
*Aug 24 23:20:25.591: %OSPF-4-ERRRCV: Received invalid packet: mismatch area
ID, from backbone area must be virtual-link but not found from 150.100.81.11,
FastEthernet0/1
The DSG shows to be getting these errors, too. However, the resolution was to
use ip ospf mtu-ignore. However, that didn't resolve my issue, even after
enabling on all devices.
My R8 Config-
R8#sh run int f0/1
Building configuration...
Current configuration : 117 bytes
!
interface FastEthernet0/1
ip address 150.100.81.8 255.255.255.0
ip ospf mtu-ignore
duplex auto
speed auto
end
I have configured mtu-ignore on all of the interfaces running OSPF on the
switches and the router interface.
My MTU is set at 1508 on all of the switches (and I don't know how to verify
the routers MTU).
What am I missing? The ERRRCV errors are occuring every 10 seconds.
Regards,
Jay McMickle- CCNP, CCSP, CCDP, MCSE
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