Avaya Troubleshooting Routers Guide de dépannage télécharger pdf (Page 240)

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

1 2 ... 235 236 237 238 239 240 241 242 243 244 245 ... 253 254

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Avaya Troubleshooting Routers Guide de dépannage Page 240