HP 7102dl - ProCurve Secure Router Configuration Manual page 887

OSPF: Update LSA: id=192.168.3.1 rtid=192.168.3.1 area=0.0.0.2 type=1
b09:46:01:
Receiving OSPF packet from 10.20.20.1 to 224.0.0.5 on tunnel 1
Length:32
Neighbor's MTU
09:46:01: OSPF: Processing database description packet from nbr
192.168.100.1 (seq=104111321)
09:46:01: OSPF: Neighbor 192.168.100.1 packet's MTU (1472) does not
MTU must
match ours (0)
match
09:46:01: OSPF: Sending database description packet to 192.168.100.1
with sequence 0e763dfc on tunnel 1
09:46:01:
Sending OSPF packet to 224.0.0.5 from 10.20.20.2 on tunnel 1
Length:32
Local
interface's
MTU
Figure 15-37. Incompatible MTU
6.
CurrentTime=5641597.
Database Description Packet from Router ID:192.168.100.1; Ver:2
Area ID:0.0.0.2 Checksum:0x305d; Using Null Authentication:0:0
MTU:1472 Options:0x0 Sequence Number:104111321
Router is the Master;
0 LSA Headers:
CurrentTime=5641601.
Database Description Packet from Router ID:192.168.3.1; Ver:2
Area ID:0.0.0.2 Checksum:0xedb8; Using Null Authentication:0:0
MTU:0 Options:0x0 Sequence Number:242630140
Router is the Master;
0 LSA Headers:
• Both routers have the same router ID—If both routers have the same
ID, check for a misconfigured IP address in the loopback interface.
An OSPF router takes its router ID from the highest IP address on a
loopback interface. If the router does not have a loopback interface,
it takes its ID from the highest address on any interface. However,
once the router takes an ID, it does not change it simply because a
new interface is configured. (This is one reason why it is important
to completely configure OSPF before connecting the router to the
network.) If you need to change the router's ID, you must reset OSPF.
Incorrect authentication settings can also prevent a router from establish-
ing full adjacency with its neighbors. All networks in the area should be
using the same authentication type. Determine what type this is, and if
necessary configure it on each OSPF interface. (See "Configuring OSPF
Authentication" on page 15-62.)
Remember that different networks can use different passwords, so you
might need to configure different passwords on various interfaces on the
router.
IP Routing—Configuring RIP, OSPF, BGP, and PBR
Troubleshooting Routing
15-161