Avaya Troubleshooting Routers Instrukcja Naprawy Pobierz pdf (Strona 241)

Using the Technician Interface to Configure and Run Packet Capture

B-53

00000020: 00 00 00 00 00 00 00 00 aa aa 03 00 80 c2 00 0e

00000030: 00 00 00 00 00 80 00 00 00 a3 00 00 0c 00 00 00

X.25

The X.25 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. The X.25 protocol uses the hardware’s link layer

capabilities. This means that Packet Capture receives only the frame’s Layer 3

(packet layer) data.

An example of a hexadecimal display of an X.25 packet follows:

Pkt# 8 04/26/94 09:00:42.103 X25 47 Rx

00000000: 10 01 e2 00 00 00 00 00 01 00 00 00 00 00 02 00

00000010: 1e aa aa 03 00 00 a2 80 ff 00 00 a2 02 c9 b6 00

00000020: 00 a2 02 c9 b6 81 02 01 01 00 00 00 00 00 38 10

Token Ring

The Token Ring physical media has a data link ﬁlter offset of 14 bytes plus the

RIF (routing information ﬁeld) ﬁeld, if a RIF is present. This places the data link

ﬁlter point at the DSAP (destination service access point) byte. Packet Capture

receives only LLC frames from the Token Ring. It does not receive the Access

Control and Frame Control bytes at the beginning of each packet. Packet Capture

inserts the hexadecimal value 1040 at the beginning of each packet for

compatibility and possible future use.

An example of a hexadecimal display of a Token Ring frame follows:

Pkt# 10 04/18/94 12:58:58.885 TOKEN 52 Rx

00000000: 10 40 c0 00 00 00 01 00 00 00 c5 00 00 30 42 42

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

00000020: 00 00 80 00 00 00 a3 00 00 0c 80 06 00 00 14 00

00000030: 02 00 0f 00 00 00 00 00 00 00 00 00 00 00 00 00

1 2 ... 236 237 238 239 240 241 242 243 244 245 246 ... 253 254

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Avaya Troubleshooting Routers Instrukcja Naprawy Strona 241