Information Technology Reference
In-Depth Information
Table 11-3 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table11-3
DECnet: End Nodes Cannot Find Designated Router
Possible Problem
Solution
DECnet not
enabled on router
Use the
show running-config privileged exec
command to
view the router configuration. Determine whether DECnet
global configuration and interface command specifications
are configured on the router.
1.
Enable DECnet routing on the appropriate routers and
interfaces. For detailed information on configuring DECnet,
refer to the
Cisco IOS Network Protocols Configuration
Guide, Part 2
.
2.
End nodes and
router area
number mismatch
1.
Check the configuration of end nodes and routers on the
network segment. Check the area address specified on end
nodes and routers. Use the
show running-config privileged
exec
command to view the router configuration.
2.
If an end node is not in the same area as a router on the
segment, you must either change the address of the end node
to be the same as that of a router on the segment, or you must
reconfigure a router on the segment with the same area
number as the end node.
Hello packets are
not being
exchanged
Use the
debug decnet adj privileged exec
command to
determine whether the router is sending hello packets and
whether hellos are being received.
1.
Caution:
Because debugging output is assigned high
priority in the CPU process, it can render the system
unusable. For this reason, use
debug
commands only to
troubleshoot specific problems or during troubleshooting
sessions with Cisco technical support staff. Moreover, it is
best to use
debug
commands during periods of lower
network traffic and fewer users. Debugging during these
periods decreases the likelihood that increased
debug
command processing overhead will affect system use.
2.
If no exchange is occurring, use the
show interfaces exec
command to determine whether the interface input and
output queues are full. A full input queue is indicated by a
value of 75/75, and a full output queue is indicated by a value
of 40/40.
3.
If the queues are full and no hello packets are being
exchanged, contact your technical support representative.
4.
If routers are sending hello packets, check end nodes to
determine why end nodes are rejecting hello packets.
5.
Media problem
For information on troubleshooting serial lines, refer to Chapter
15, “Troubleshooting Serial Lines.” For information on
troubleshooting LAN media, refer to the media troubleshooting
chapter that covers the media type used in your network.
