Avaya Troubleshooting Routers Guide de dépannage télécharger pdf (Page 238)

Troubleshooting Routers

B-50

ATM

The ATM 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 ATM packet follows:

Pkt# 20 04/23/94 09:57:29.968 ATM 548 Tx

00000000: 0c 80 00 85 00 4b 02 18 03 cc 45 00 02 14 01 10

00000010: 00 00 01 11 ed c9 64 00 00 01 64 ff ff ff 02 08

00000020: 02 08 02 00 69 c8 02 01 00 00 00 02 00 00 c0 20

00000030: de 00 00 00 00 00 00 00 00 00 00 00 00 02 00 02

Bisynchronous

The bisynchronous (BISYNC) protocol currently 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 01/01/94 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 04/22/94 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

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Avaya Troubleshooting Routers Guide de dépannage Page 238