Cabletron Systems Netlink FRX4000, User Manual

Page: 311 / 426

Status Displays 19-15
frame relay in RFC1490 format are known in IBM terminology as BAN Type 1
frames. Besides the encapsulation information, the main difference between BAN and
BNN LLC2 frames is that BAN sends the MAC addresses across the WAN. BAN is
usually used for connectivity to AS/400 hosts only.
Test Frame Examples
LLC2 802.5 SRB (BAN):
0016 (0027) 0300800080C200091040444400000008C0000000222282700004F3
03
= Control
00
= PAD
80
= NLPID
00 80 C2
= OUI
00 09
= PID
10
= PAD
40
= Frame Control
444400000008
= DMAC
C000000002222
= SMAC
8270
= RIF routing control field (2 bytes)
00
= DSAP
04
= SSAP
F3
= Test (
BF
= XID,
7F
= SABME,
73
= UA,
53
= DISC,
1F
= DM,
97
= FRMR)
LLC2 802.3 TB (bridged):
0016 (0025) 0300800080C2000722220000001002000000444400030004F3
03
= Control
00
= PAD
80
= NLPID
00 80 C2
= OUI
00 07
= PID
222200000010
= DMAC
020000004444
= SMAC
0003
= Frame length
00
= DSAP
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