Cabletron Systems ZX-250 manual Troubleshooting Pnni Links, Troubleshooting Congestion

Troubleshooting Troubleshooting PNNI LinkS

–•If working through these questions does not solve the problem, contact Cabletron Systems Customer Service. (See Appendix D, “Technical Support.”)

5.3TROUBLESHOOTING 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).

UIf 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.

2p›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.

UIf 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.

UIf 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.

5.4TROUBLESHOOTING 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.

SmartCell ZX-250 User Guide 5-3