OSI/TS Configuration and Management Manual

Performing Monitoring and Troubleshooting Guide
OSI/TS Configuration and Management Manual—424831-001
4-24
PTrace and Trace Analysis
CONTROL request is in P4 (in the range P1-6, the fourth word): Control 11
(%000013):
When troubleshooting an OSI/TS subsystem using X25AM, you seldom need to look at
more than the SELECT L3 mask. This mask causes all the packets to be displayed,
along with most of the attributes related to the connection. The following example
shows a trace of a call request packet to subdevice number 0 (SDN #000):
To further analyze L3 packets, you can use the following commands:
FILTER CALL
FILTER CLEAR
These commands display all the call and clear packets sent and received.
The following command limits the display to a specific subdevice:
FILTER SDN name
The following command limits the display to a specific logical channel number (an X.25
circuit):
FILTER LCN circuit-number
You can use the SELECT L2 mask to determine the LAPB information frames
transmitted to and from the Data Link Layer. The following commands omit all the RR
frames, thus reducing the display:
SELECT L2
FILTER NOTRR
The following shows a trace of a typical incoming all request in a Layer2 information
frame:
02:48:44:270 >000.010 #31 L4^LCB^In
SDN #001/%001
Control LCB 77BF P1-6 %144000 %000026 %000000 %000013 %000020
%000000
02:48:44:600 >000.000 #43 L3 Pkt In
SDN #000/%000 LEN #0024 GFI(0001) MOD8 LGN/LCN $0FE
Call^req
CALLED ADDRESS ($C) 408333111101
CALLING ADDRESS ($C) 408333222201
FACILITIES ($03)
CCITT STANDARD X.25 FACILITIEIS ---
WINDOW SIZE FROM CALLED DTE: 02 FROM CALLING DTE: 02
USER DATA ($04) 00000000
02:48:44:600 >000.000 #39 LAPB In
A/C($012E) DCE IFRAME P=0 N(S)=7 N(R)=1
000: 012E 10FE 0BCC 4083 3311 1101 4083 3322
008: 2201 0343 0202 0000 0000