System information

Troubleshooting DECnet 11-269

DECnet: Poor Performance

Timer mismatch Step 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:

We are the designated router

Sending HELLOs every 15 seconds, routing updates 40

seconds

[...]

Step 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.

Media problem

Step 1 Use the show interfaces exec command and look for CRCs

in the output.

Step 2 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.

Input and Output queue drops Step 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.

Step 2 If drops are occurring, contact your technical support representative for

assistance.

1 CRC = cyclic redundancy checks

Possible Problem Solution