Information Technology Reference
In-Depth Information
Table11-2
DECnet: Connections to DEC Hosts Fail over Router (Router Problem) (continued)
Possible Problem
Solution
Actual number of
hops to the desti-
nation is more
than the
configured
maximum number
of hops
1.
Use the
show decnet interface
command to determine the
maximum number of hops allowed for intra-area routing.
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.
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
1.
Use the
show decnet access-list privileged exec
command
to determine whether there are DECnet access lists
configured on the router.
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.
3.
If packets are being dropped, disable all access lists on the
router using the
no decnet access-group
interface
configuration command.
4.
Determine whether connections to hosts are now possible. If
connections are made successfully, a misconfigured access
list is probably the problem.
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.
6.
Modify the access list as necessary. Make sure to include
explicit
permit
statements for traffic that you want to be
forwarded normally.
7.
If problems persist, continue the process until you have
isolated all problem access lists.
continues
