System information

Troubleshooting DECnet 11-259
DECnet: Connections to DEC Hosts Fail over Router (Router Problem)
Actual cost to the
destination area
is more than the
configured cost
Step 1 Use the show decnet interface exec command to determine the configured
maximum cost to the destination area.
Step 2 Use the show decnet route exec command to determine the actual cost to the
destination area.
Step 3 If the actual cost is more than the configured maximum cost, increase the
maximum cost configured on the router.
On Level 1 routers, use the decnet max-cost global configuration command to
increase the area maximum cost.
On Level 2 routers, use the decnet area-max-cost global configuration command
to increase the area maximum cost.
Actual number of hops
to the desti- nation is
more than the
configured maximum
number of hops
Step 1 Use the show decnet interface command to determine the maximum number of
hops allowed for intra-area routing.
Step 2 Use the show decnet route exec command to determine the actual number of
hops to the destination as shown in the DECnet routing table.
Step 3 If the actual number of hops is more than the configured maximum allowed hops,
increase the maximum hops configured on the router.
On Level 1 routers, use the decnet max-hops global configuration command to
increase the maximum hops.
On Level 2 routers, use the decnet area-max-hops global configuration
command to increase the maximum number of hops.
Access list is
misconfigured
Step 1 Use the show decnet access-list privileged exec command to determine whether
there are DECnet access lists configured on the router.
Step 2 If there are access lists applied to router interfaces, use the
debug decnet connects privileged exec command to determine whether
important packets are being forwarded properly.
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.
Step 3 If packets are being dropped, disable all access lists on the router using the
no decnet access-group interface configuration command.
Step 4 Determine whether connections to hosts are now possible. If connections are
made successfully, a misconfigured access list is probably the problem.
Step 5 Enable access lists on the router using the decnet access-group interface
configuration command. Enable the lists one at a time until connectivity is lost, at
which point you have found the problem access list.
Step 6 Modify the access list as necessary. Make sure to include explicit permit
statements for traffic that you want to be forwarded normally.
Step 7 If problems persist, continue the process until you have isolated all problem
access lists.
Possible Problem Solution