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Troubleshooting Routers

B-54

FDDI

The FDDI physical media has a data link ﬁlter offset of 13 bytes. This places the

data link ﬁlter point at the DSAP byte. Packet Capture does not receive all frames

from the FDDI because the hardware handles some frames.

An example of a hexadecimal display of an FDDI frame follows:

Pkt# 10 04/18/94 12:59:04.017 FDDI 51 Rx

00000000: 50 80 01 43 00 00 00 00 00 c5 00 00 30 42 42 03

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

00000020: 00 80 00 00 00 a3 00 00 0c 80 08 00 00 14 00 02

00000030: 00 0f 00 b7 00 00 00 00 00 00 00 00 00 00 00 00

HSSI

The HSSI physical media works exactly the same way as the previously described

SYNC medium, except for the HPTP (STANDARD) protocol.

HPTP has a data link ﬁlter offset of 14 bytes from the beginning of the packet.

This places the data link ﬁlter point at the ﬁrst byte after the Length/Type ﬁeld.

The HPTP packets do not have an address or control ﬁeld.

An example of a hexadecimal display of an HSSI frame follows:

Pkt# 7 04/21/94 09:17:53.957 HPTP 52 Rx

00000000: 01 80 c2 00 00 00 00 00 a3 00 00 0c 00 26 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 01 00 00 14 00

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

ISDN

The ISDN B Channel works the same way as described in the SYNC section for

each of the protocols supported over ISDN.

The ISDN D Channel currently does not have a special data link 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.

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