Information Technology Reference
In-Depth Information
Table 11-9 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table11-9
DECnet: Poor Performance
Possible Problem
Solution
DECnet traffic
problem
Use the
show decnet traffic exec
command and check the
Received and Forwarded fields in the output. In most cases,
the values in these fields should match.
1.
If the values do not match, check the Returned, Converted,
Access Control Failed, No Route, and Encapsulation Failed
fields to see what is causing the performance problem.
2.
If the problem cannot be isolated or solved, contact your
technical support representative for assistance.
3.
Timer mismatch
1.
Use the
show decnet interface exec
command on all routers
in the network. Verify that the values configured for hello
timers and routing update timers are consistent among all
routers in the network.
The following is example output from the
show decnet interface
command:
C4500#show decnet interface
[...]
Ethernet0 is up, line protocol is up,
encapsulation is ARPA
Interface cost is 50, priority is 64, DECnet
network: 0
We are the designated router
Sending HELLOs every 15 seconds, routing
updates 40 seconds
[...]
2.
If timer values are inconsistent, bring routers into
conformance using the
decnet hello-timer
and the
decnet
routing-timer
interface configuration commands. The hello
timer can be restored to its default, 15 seconds, by using the
no
form of the command.
Use the
show interfaces exec
command and look for CRCs
1
in the output.
Media problem
1.
If there are CRCs, there is probably a media problem. Refer
to the media troubleshooting chapter that covers the media
type used in your network.
2.
Input and Output
queue drops
1.
Use the
show interfaces exec
command to check the input
and output queues. Look for drops. Each number is followed
by a slash, the maximum size of the queue, and the number
of packets dropped because the queue is full.
2.
If drops are occurring, contact your technical support
representative for assistance.
1.
CRC = cyclic redundancy checks
