IBM 8285 Nways, Инструкция по установке и эксплуатации

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A station cannot register to an LES located behind a WAN (VP-tunnel).
Explanation:
Ÿ Some of the connections through the VP tunnel work, but not all, especially the ADD_PARTY to put the stations
on the LES Multicast Tree. The workgroup switch error-log is full of messages like 'Invalid Message Length'.
Ÿ The WAN (public network proving the VP-tunnel) uses the VCI=5 for its own purposes, and there is a conflict with
the workgroup switch which also uses VCI=5 (ATM-Forum Signalling VCI).
Steps to Take:
1. Ask your public network provider if they use the VCI=5. If necessary, put an ATM device between the WAN and
the workgroup switch to do the translation of Signalling VCI to a value other than 5.
No Traffic in a Client Environment.
Steps to Take:
1. Make sure that each LES client does not have more than 12 virtual connections.
Problems between two LAN-emulated stations, or between a LAN-emulated station and a LAN station located
behind a bridge.
Steps to Take:
1. For performance problems, first consider the frame sizes defined at the workstation level and at the bridge level.
2. For connection problems, first consider the Nways Campus Manager (ATMC) and LAN emulation server, which
can provide you with a lot of information through the LES monitor.
Ÿ If you know neither the emulated MAC addresses of the stations nor the ATM addresses of these stations,
use the ATMC Interface Configuration panel to get their ATM addresses.
Ÿ Once you know either the ATM addresses or emulated MAC addresses of the stations, look at the Registered
End-systems window of the LES monitor and check that the stations are registered.
Ÿ Once you know which station is NOT registered, record its ATM address and look at the Call Status History
window of the LES monitor. You should find a recorded call from that ATM address that failed for a certain
'cause
X , reason Y '. The cause X shows you the Q.2931 cause of the failure. Refer to “Q.2931 Error Codes
for Clear Causes” on page 207.
Ÿ If you not find any call from that ATM address, that station has not been able to reach the LES. Use the
ATMC Statistics Control Panel to open the Clear Table of the workgroup switch directly attached to the failing
station (select 'Node' and 'Call Logging'). That table should have entries with a source ATM address being the
one of the failing station. You will get a Q.2931 cause of the failure. Refer to “Q.2931 Error Codes for Clear
Causes” on page 207.
Chapter 21. Troubleshooting
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