Problems of ATM connections/performance through a WAN (VP tunnel).
Steps to Take:
1. Check the Switch configurations at both sides:
check that the VPI corresponds to the VPI provided by your network provider.
check that the bandwidth is lower or equal to the Maximum Peak Rate negotiated with your network provider.
The actual bandwidth used by your media modules is the maximum one (155 Mbps for an A4-MF155 module, 100
Mbps for an A4-SC100 module etc.), even if a lower value is specified with the SET PORT command.
Check that one IISP port on one side is defined as 'network' and that the IISP port on the other side is defined
as 'user'.
if you are using singlemode A4-MF155 modules, you probably have to define the clocking as external, using
the SET PORT command (the clock is usually provided by the WAN). In addition, to specify the type of
network (SONET or SDH) at the end of the SET PORT command.
2. If the previous steps did not help, then you require an ATM Analyzer for the following tests:
Hardware wrap test through the WAN up to the media module, install the ATM Analyzer at one side of the
WAN, and the 8265 at the other. Disable your IISP port, and enter the command WRAP slot.port
REPLY_MODE ENABLE. Your port is now redirecting Received Cells to the transmit side. Now, from the ATM
Analyzer, generate traffic on the VCI=5, and compare the outgoing cells with the incoming cells. If some cells
are lost or corrupted, contact your public network provider. When you are finished, enter the command WRAP
slot.port REPLY_MODE DISABLE.
Hardware wrap test through the WAN up to the media module, install the ATM Analyzer at one side of the
WAN, and the 8265 at the other. Enable your port, and create a PVC from the VCI=x to a VCI=y on the same
port, using the command SET PVC. Check that the PVC is active using the command SHOW PVC ALL. Now,
from your ATM Analyzer, generate traffic on the VCI=x, and compare it with the received cells on the VCI=y. If
some cells are lost or corrupted, contact your IBM representative.
Bad Communication Between 8265 and 25 Mbps Adapters
Explanation: The port is either
NOT-IN-SERVICE
, or is
UP
but some cells are lost.
The flow control on all 25 Mbps adapters attached to the 8265 must be disabled. This flow control (of OAM F4 cells) is
not supported on the 8265, whereas it is supported on the ATM concentrator 8282.
Steps to Take: Disable the flow control on the 25 Mbps adapters. Refer to the documentation associated with the
adapter.
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IBM 8265: User's Guide
Содержание 8265 Nways ATM Switch
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