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ATM Services Notes 53
VTAM Version 4.2 requires PTF #UW20787. VTAM Version 4.3 requires PTF
#UW20788.
Visible symptoms of this problem can be seen as a lack of network management
data for PUs that are downstream of a NETBuilder II bridge/router using APPN DLU
services. The NetView message “AAU251I AAUDRTIB 02 UNEXPECTED SENSE
CODE X'1002' ENCOUNTERED FOR TARGET=pu_name” is printed in the log file
when this problem occurs.
ATM Services Notes This section describes notes, cautions, and other considerations to be aware of
when using the Enterprise OS software with ATM services. The topics are
presented in alphabetical order.
ATM Emulated LANs Enterprise OS software supports a system maximum of 32 ATM emulated LANs.
ATM LAN Emulation
Clients and Large 802.3
Frames
This release of LAN emulation software does not support large 802.3 frame
encapsulation as specified in the LANE standard 1.0. When IP routing is used from
FDDI to an emulated LAN, packets larger than 1500 are sent fragmented per IP
fragmentation rules.
ATM Connection Table In a LAN Emulation environment with many LAN Emulation Servers (LESs), a
performance drop may occur when the NETBuilder bridge/router is able to
connect to the LAN Emulation Configuration Server (LECS), but many of the LESs
are down or unreachable. Disabling the ETHATM virtual ports corresponding to
the unreachable LESs will alleviate this situation.
Deleting ATM Neighbors Bridge ATM Neighbors must be deleted before the associated virtual ports can be
deleted.
Source-Route
Transparent Gateway
The source-route transparent gateway is not currently supported on ATM LAN
emulation ports.
WAN Protocols and
Services Notes
This section describes notes, cautions, and other considerations to be aware of
when using the Enterprise OS software with WAN protocols and services. The
topics are presented in alphabetical order.
ACCM Not Configurable The ACCM (Async Control Character Map) used for Async PPP cannot be
configured. During LCP negotiation, the NETBuilder bridge/router always proposes
an ACCM of all zeros and agrees to whatever the peer negotiates.
Asynch Tunnelling on
Serial Ports
For best results, set the LineType parameter to Leased and set the SuperStack II
NETBuilder bridge/router model 32x connector type for the universal port to
RS-232. For the path to come up, the bridge/router must see a DTR or DSR control
signal from the device. Or, if the device does not generate a control signal, a
loopback connector should be used to supply the control signal.
Automatic Line
Detection
When set to the value of Auto, the -PATH LineType parameter first attempts to
bring up the path as a leased line by raising the data terminal ready (DTR) signal. If
the path comes up but a DTR-base dial modem is attached to the path, the
modem does not hang up until brought down manually with the HangUp
command. To avoid this situation, set the -PATH LineType parameter to Dialup.