Some ATM stations cannot talk to LAN stations behind PARALLEL bridges.
Explanation:
The 8281 bridge has a limitation of 256 ATM connections. One would think that multiplying the number of 8281
bridges (in parallel) would multiply the number of available connections. Doing so will lead to the problem that only
256 stations can immediately establish connections with the bridges.
In a configuration with parallel 8281 bridges (those bridges register to the same LAN Emulation Server, and they
connect to the same LAN), there may be collisions in terms of connections. Indeed, when an ATM station calls a
LAN station behind the 8281 bridges, each 8281 bridge will respond by establishing a connection to the originating
ATM station. In a network where the number of ATM stations exceeds 256, which is the maximum number of
SVCs per 8281, some stations will not be able to connect until the bridges clear their SVCs that are unused (aging
out process).
Steps to Take:
1. Just wait up to 4 minutes (aging time on the 8281 bridge), or avoid parallel bridging.
LES Monitor: after 3 minutes, the workstation is deregistered from the LES.
Explanation: The workstation did not send the re-registration message within 3 minutes.
Steps to Take:
1. Ensure that the port for the workstation is connected properly. If not green, ensure that the cable between the
workgroup switch and the workstation is connected properly. Shutdown, then power off the workstation and restart.
If the problem persists, contact your workstation/adapter supplier.
In a multiple Token-ring bridges configuration, a Token-ring bridge cannot registr to the LES.
Explanation: Different ring numbers are assigned to the ATM ports of two bridges connected to the same LES. The
numbers should be equal.
Steps to Take:
1. Check the ring numbers of the ATM ports of all the bridges attached to the same LES. Change them if necessary.
LES Monitor: Bridge is on General Multicast Tree, but not on Bridge Multicast Tree.
Explanation: The bridge did not send its route descriptors to the LES.
Steps to Take:
1. The bridge is faulty. Contact your IBM service representative.
At workstation reboot: the ATM adapter initialization failed.
Explanation: The port is not enabled on the switch or concentrator that is attached to the workstation, or it is not a
UNI port.
1. From the console, or from the SNMP Manager (ATMC), enable the corresponding port as a UNI port.
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IBM 8285 Nways ATM Workgroup Switch:
Installation and User’s Guide
Summary of Contents for 8285 Nways
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