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Watson-Ethernet-Manual.doc
Version 3.3-01
Watson Ethernet
Operating Manual
Revision: 2010-01-20
3-13
Notes:
The Watson Ethernet tabletop modems are transparent to VLANs, i.e. VLAN
tags are preserved during transmission over the DSL.
The Watson Ethernet tabletop modem has a single address learning data-
base which does not take VIDs into account.
3.2.7 Stacked VLANs
The Watson Ethernet plug-in also supports double-tagged VLANs (a.k.a stacked
VLANs). Stacked VLANs is a method to increase the number of available VIDs in
a structured and hierarchical fashion that is backward-compatible with single-
tagged VLANs as long as the network supports packet sizes of 1'526 bytes or
more.
This method places an extra tag (often referred to as the S-TAG or Service Pro-
vider Tag) in front of the first tag (known as the C-TAG or Customer Tag). The
double tag format is shown in Figure 3-11.
Figure 3-11: Stacked VLAN frame format
Each port can be configured for double tagging in incoming (ingress) and out-
going (egress) direction. Normally ingress and egress double tagging are
enabled simultaneously.
A port with ingress double tagging enabled expects double tagged frames. The
port will remove the outer tag. If a frame contains only a single tag then this tag
will be removed. Untagged frames are not modified.
After removal of the outer tag the Ethernet bridge will process the packet as a
single-tagged VLAN packet, cf. 3.2.3. For packets with a single tag or no tag the
default tag for this port will be used to determine VLAN membership and possible
egress ports.
A port with egress double tagging enabled will transmit all packets with an extra
outer tag. When the packet had no tag, it will be sent with a single tag. When the
packet had a single tag, it will egress double-tagged. The tag added is the de-
fault tag of the source port of the packet.
Note:
The tabletop modems support frame sizes of 2’048 bytes and are transparent to
double-tagged Ethernet packets.
- Declaration of Conformity 3
- Limited Product Warranty 9
- Table of Contents 11
- 1 Related Documents 17
- 2 Overview 19
- 3 Modem Features 23
- 3.1.2 Multipair operation 24
- 3.1.4 Power Backoff 26
- 3.1.7 Wetting Current 28
- 3.1.8 Master / Slave 29
- 3.1.9 DSL Clocking 29
- 3.2.1 Ethernet over DSL 29
- 3.2.2 Ethernet Bridging 30
- 3.2.4 VLANs 31
- 3.2.5 VLAN Examples 31
- 3.2.7 Stacked VLANs 35
- 3.3.1 Ethernet over DSL 41
- 3.3.2 VLAN features 41
- 3.3.4 Cisco HDLC 42
- 3.4 Firmware update 43
- 3.5 Management 43
- DISCONNECT 45
- 3.7 Test loops 48
- 3.8 Password protection 49
- 4 Powering 51
- 5 LEDs and Alarms 53
- 5.2 Tabletop LEDs 54
- 5.3 Alarm Conditions 55
- 5.4 Alarm Relays 55
- 5.5 Initialization Errors 56
- 6 The Monitor 57
- 6.2 Addressing of Plug-ins 58
- 6.3 Naming of ports 59
- 6.4 Telnet Access 59
- 6.5.1 Welcome Screen 60
- 6.5.2 Menus 60
- 6.5.4 Tab completion 61
- 6.5.5 Help 61
- 6.5.6 Command History 61
- 6.5.7 Continuous Displays 62
- 7.1 Introduction 63
- 7.2.1 General Commands 64
- DEFAULT Configuration 66
- 7.3.1 Diagnostic 89
- 7.3.2 Status (Plug-in) 90
- 7.3.3 Status (Tabletop) 92
- 7.3.4 Alarms 93
- 7.3.5 Test loops 95
- 7.3.6 Reset Commands 95
- 7.4.1 G.826 Statistics 96
- 7.4.2 Ethernet Statistics 97
- 7.5.1 Connection control 100
- 7.5.2 Inventory 100
- 7.5.3 Password 101
- 7.5.4 Firmware Update 103
- 8 SNMP 105
- ENTITIY-MIB 106
- 8.1.3 SNMP Configuration 107
- 8.1.4 The Entity MIB 107
- 8.1.6 The ifTable 109
- 8.2 MIB Reference 110
- 8.2.5 RMON (RFC 2819) 111
- 8.2.6 IF MIB (RFC 2863) 111
- 8.2.11 MAU MIB (RFC 3636) 112
- 8.2.15 HDSL MIB 114
- 8.2.16 Schmid MIB 115
- 8.2.17 Watson MIB 115
- 9 Front and Rear Panels 117
- 10 Connectors and Cables 119
- 10.2 DSL Interface 121
- 10.2.2 DSL Cable 122
- 10.3 Ethernet Interface 123
- 10.4 Monitor Interface 123
- 10.5 Power and Grounding 124
- 11.1 Interfaces 127
- 11.2 Power Consumption 128
- 11.3 Ethernet 128
- 11.5 Management Functions 129
- 11.6 MTBF 129
- 11.7 Environment 130
- 12 Terminology 131
- 13 Product Order Codes 133
- Revision: 2010-01-20 134
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