Avaya Troubleshooting Routers Instrukcja Naprawy Strona 240

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Troubleshooting Routers
B-52
PTP (STANDARD)
The PTP, or Standard, protocol 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
LENGTH/TYPE field.
Packet Capture receives the PTP 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 PTP packet follows:
Pkt# 9 04/22/94 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
SDLC
The SDLC protocol currently 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 an SDLC packet follows:
Pkt# 1 07/20/95 14:45:27.910 SDLC 2 Tx
00000000: d1 bf
SMDS
The SMDS protocol currently 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 an SMDS packet follows:
Pkt# 10 04/22/94 08:09:20.211 SMDS 88 Rx
00000000: 05 03 00 00 00 87 00 4c e1 58 07 97 12 12 ff ff
00000010: c1 58 07 97 54 36 ff ff 05 03 00 00 03 00 01 00
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