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Problems in an IBM Proprietary LAN Emulation Environment
This section details the problems that may occur during the setup of the IBM LAN emulation environment.
Such an environment may include concentrators (8282) and bridges (8281), the external IBM LAN
Emulation Server (LES), workstations (WS), ATM Workgroup Switches (8285), Nways Ethernet LAN
Switch (8271), Nways Token-Ring LAN Switch (8272), Nways Ethernet RouteSwitch (8273), Nways LAN
RouteSwitch (8274), Nways Multiprotocol Switch Services Server (8210), and the 8265s.
A workstation/bridge cannot connect to another workstation/bridge.
Steps to Take:
1. Using the LES monitor, check in the list of registered end stations that both workstation/bridge addresses are
present. If you do not know the ATM addresses of your workstation bridge, use the Campus Manager - ATM
Interface Configuration panel for the ports attached to your workstation/bridge. If both addresses are registered in
the LES, then proceed to step 2).
If one workstation/bridge address is missing, then use the Call Status History provided by the LES monitor to get
the Q2931 cause of the failing call. The missing station/bridge has probably a wrong LES ATM address defined in
its configuration. Check the missing station's configuration.
2. Both workstation/bridges are registered to the LES, but one cannot call the other one, because the LES is not
available any more (port disabled, or not-in-service). The LES does not tell you that it has lost its address,
because it only tells that once the connection to the 8265 is returned.
Check that the LES cable is well plugged, then check that the LES port is enabled. If it stays enabled and
not-in-service, then the LES is faulty. Contact your IBM representative for investigation, or re-boot the LES.
LES Monitor Statistics: Default Vccs counter oscillating, too few registered workstations.
Steps to Take:
Explanation: The workstation knows its ATM address, but that address has been de-registered at the
Switch/Control-point level. This happens when the workstation is behind a concentrator (8282) that has been
disconnected from the switch for a short time.
Note: You can check whether the station is registered in the 8265 by using the command SHOW
REACHABLE_ADDRESS.
1. Wait a few minutes for the new registration to take place.
Clear Table: a lot of SVCs were cleared with Cause 31.
Explanation:
A high-bandwidth (100 Mbps or 155 Mbps) workstation or bridge has tried to call a low-bandwidth workstation (25
Mbps). The call was rejected by the low-bandwidth workstation because the bandwidth specified in the Q2931
parameters (even for a UBR call) was too large. This is normal.
The source or bridge retried to call the destination station with a lower bandwidth/bit-rate successfully. No action
required.
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IBM 8265: User's Guide
Summary of Contents for 8265 Nways ATM Switch
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Page 17: ...Part 1 Configuring Your ATM Network Copyright IBM Corp 1994 1998 1...
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Page 107: ...Part 2 Managing the 8265 Copyright IBM Corp 1994 1998 91...
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