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Using the Technician Interface to Configure and Run Packet Capture

308656-14.00 Rev 00

B-53

Bisynchronous

The bisynchronous (BISYNC) protocol does not have a special data link filter. If

you configure a data link filter, set the offset to 0. The data link filter works the

same way that the MAC filter works. The captured bisynchronous packets contain

a 4-byte prefix that consists of internal information. This prefix is not present in

the packets as they appear on the wire. The software uses the prefix to calculate an

offset into the packet for filtering.

An example of a hexadecimal display of a bisynchronous packet follows:

Pkt# 1 01/01/98 03:17:56.284 BISYNC 9 Tx

00000000: 00 00 07 52 40 40 7f 7f 2d

Frame Relay

Frame Relay does not have a special data link filter offset. If you configure a data

link filter, set the offset to 0. The data link filter works the same way that the MAC

filter works.

An example of a hexadecimal display of a Frame Relay packet follows:

Pkt# 10 04/22/98 08:10:24.706 FR 45 Rx

00000000: 04 01 03 00 80 00 80 c2 00 0e 00 00 00 00 00 80

00000010: 00 00 00 a3 00 00 0c 00 00 00 00 80 00 00 00 a3

00000020: 00 00 0c 80 05 00 00 14 00 02 00 0f 00 9e 00 0e

Frame Relay Switch and SMDS Switch

The Frame Relay switch and SMDS switch work the same way as described in the

“Frame Relay

” and “SMDS” sections.

LAPB

The Link Access Procedure-Balanced (LAPB) protocol does not have a special

data link filter offset. If you configure a data link filter, set the offset to 0. The data

link filter works the same way that the MAC filter works.

An example of a hexadecimal display of a LAPB packet follows:

Pkt# 7 07/20/95 14:22:17.820 LAPB 5 Rx

00000000: 03 64 10 01 81

1 2 ... 242 243 244 245 246 247 248 249 250 251 252 ... 267 268

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Avaya Troubleshooting Routers Guía para resolver problemas Pagina 247