Cabletron Systems SmartCell ZX-250, User Manual

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SmartCell ZX-250 User Guide 5-3
Troubleshooting Troubleshooting PNNI LinkS
–•
If working through these questions does not solve the problem, contact Cabletron Systems Customer
Service. (See Appendix D, “Technical Support.”)
5.3 TROUBLESHOOTING PNNI LINKS
You have physically connected another company’s ATM switch with your SmartCell ZX-250. Each switch supports
PNNI, but there is no connectivity between the two devices. Use the following procedure to diagnose and resolve the
problem.
Examine the link state on each switch (
show PNNILink
on SmartCell ZX-250).
U
If the link does not appear in the Link list, check the following:
†
Is the connecting port on each switch configured for PNNI? If no, configure both ports for
PNNI.
2 p›F
On the SmartCell ZX-250, use the
show portconfig
command to determine
whether the port is PNNI. If
show portconfig
displays
autoConfig
as the port
configuration, use the
set portconfig
command to disable ILMI and manually
set the port to PNNI.
†
Examine the VCC masks for each switch. Are the switches using compatible VPI/VCI pairs? If
not, adjust the VCC mask so that both switches use compatible VPI/VCI pairs.
U
If link state is “attempt,” check the following:
†
Is the PNNI peer group ID the same on both switches? If not, set both peer group IDs to the same
value.
†
Is the PNNI node ID the same for both switches? If not, set the PNNI node ID to the same value.
Especially check that the first two octets (peer-group level and lowest-level node) of the node
ID are the same for both switches.
U
If the link state is “2WayInside,” check the ATM route tables on each switch (
show ATMRoute
on
SmartCell ZX-250).
†
If the switches are supporting end systems or have clients, does the net prefix of each switch
appear in the ATM route table of the other?
If no, check both switches for signaling and ILMI misconfiguration.
If yes, contact Cabletron Systems Customer Service.
5.4 TROUBLESHOOTING CONGESTION
If the bandwidth of your SmartCell ZX-250 begins to decrease, and if connections are being lost or packets are being
dropped at a high rate, it’s possible that your switch is becoming congested. Congestion can occur on the port level,
the global switch level, or both levels.
If you suspect that your SmartCell ZX-250 switch is experiencing congestion, follow the steps outlined below to
diagnose and resolve the cause of congestion.