Cabletron Systems FRM User Manual - page 287
St atus Displays
19-15
04
= SSAP
F3
= Test (
BF
= XID,
7F
= SABME,
73
= UA,
53
= DISC,
1F
= DM,
97
= FRMR)
Bridged Protocol Data Unit (BPDU) frame (see 802.1d Spanning Tree Algorithm):
0016 (0043) 0300800080C2000E000000000180000060BB0039080000
Packet is the same as any 802.3 TB packet, except that a different PID is used.
BPDUs use a
00 0E
PID.
RIP (routed IP) packet traced on DLCI 16:
0016 (0054) 03CC450000340066000014119E4D0202020202020201020802
080020EE930201000000020000030000000000000000000000
000000
03
= Q.922 control byte
CC
= NLPID for IP
45
= IP version/header length
00
= IP type of service
00 34
= total length of packet in hex
00 4E
= Identifier
00 00
= Flags/fragment offset
14
= Time To Live (14 seconds/hops)
11
= Protocol (hex 11 is 17 UDP, hex 01 is 01 ICMP, hex 06 is 06 TCP, etc…)
9E 65
= IP header checksum
02 02 02 02
= IP source address
02 02 02 01
= IP destination address
0208
= UDP source port (520)
0208
= UDP destination port (520)
0020
= UDP length (20 hex is 32 decimal)
EE93
= UDP header checksum
02
= RIP Command byte (Response)
01
= RIP Version 1
00 00
= must be zero
03000000
= IP address (reporting route to network
3.0.0.0
)
00000000
= must be zero
00000000
= must be zero
00000000
= Metric (hops 1-15; note that 16 is unreachable)
ARP (bridged IP) Request packet traced on DLCI 16:
0016 (0076) 0300800080C20007FFFFFFFFFFFF0080C7193D800036AAAA03
0000F8080600010800060400010080C7193D80C6554ABC0000
00000000C6554A015F4C5445585400000400000000000000A029
03
= Q.922 control byte
00
= Pad byte
80
= SNAP NLPID for a bridged 802.3 frame
0080C2
= OUI
0007
= PID
FFFFFFFFFFFF
= Destination MAC address
0080C7193D80
= Source MAC address
0036
= length of packet in hex (54 bytes follow)
AAAA03
= SNAP Header
0000F8
= Protocol ID (SNAP OUI will see 000000 or 00000C)
0806
= Ethertype (ARP)
0001
= Hardware (Ethernet 10MB)