Avaya Troubleshooting Routers Instrukcja Naprawy Pobierz pdf (Strona 248)

Troubleshooting Routers

B-54

308656-14.00 Rev 00

Passthru

The Passthru (PASS) 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 Passthru packet follows:

Pkt# 9 04/26/98 09:00:50.730 PASS 24 Tx

00000000: 07 03 00 00 a2 02 c9 b6 00 00 a2 02 c9 b6 81 02

00000010: 01 01 00 00 00 00 00 2a 00 00 00 00 00 00 00 00

Standard PPP

Standard point-to-point protocol (PPP) 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 PPP packet follows:

Pkt# 9 04/18/98 12:58:45.551 PPP 39 Rx

00000000: ff 03 02 01 00 00 00 00 00 80 00 00 00 a3 00 00

00000010: 0c 00 00 00 00 80 00 00 00 a3 00 00 0c 80 02 00

00000020: 00 14 00 02 00 0f 00 1d 00 00 00 00 00 00 00 00

Nortel Networks Proprietary PPP

Nortel Networks Proprietary PPP has a data link filter offset of 16 bytes from the

beginning of the packet. The data link filter is the first byte after the TYPE/

LENGTH field.

Packet Capture receives the PPP packets without a reliable address field. This

means that the packets marked Tx (for “transmit”) have an accurate address field,

but the packets marked Rx (for “receive”) do not have an accurate address field.

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

Pkt# 9 04/22/98 08:07:52.812 PTP 54 Rx

00000000: 03 03 01 80 c2 00 00 00 00 00 a3 00 00 0c 00 26

00000010: 42 42 03 00 00 00 00 00 80 00 00 00 a3 00 00 0c

00000020: 00 00 00 00 80 00 00 00 a3 00 00 0c 80 01 00 00

00000030: 14 00 02 00 0f 00 6b 0d 00 00 00 00 00 00 00 00

1 2 ... 243 244 245 246 247 248 249 250 251 252 253 ... 267 268

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Avaya Troubleshooting Routers Instrukcja Naprawy Strona 248