Extreme Networks WM-4T1i WAN User manual

Extreme Networks, Inc.
3585 Monroe Street
Santa Clara, California 95051
[phone]
http://www.extremenetworks.com
WAN Module Installation
and User Guide
(Includes WM-4T1i Module Installation and User Guide)
Published: December, 2001
Part number:100095-00 rev02

ii
©2001 Extreme Networks, Inc. All rights reserved. Extreme Networks and BlackDiamond are
registered trademarks of Extreme Networks, Inc. in the United States and certain other jurisdictions.
ExtremeWare, ExtremeWare Vista, ExtremeWorks, ExtremeAssist, ExtremeAssist1, ExtremeAssist2,
PartnerAssist, Extreme Standby Router Protocol, ESRP, SmartTraps, Alpine, Summit, Summit1,
Summit4, Summit4/FX, Summit7i, Summit24, Summit48, Summit Virtual Chassis, SummitLink,
SummitGbX, SummitRPS, and the Extreme Networks logo are trademarks of Extreme Networks, Inc.,
which may be registered or pending registration in certain jurisdictions. The Extreme Turbodrive logo
is a service mark of Extreme Networks, which may be registered or pending registration in certain
jurisdictions. Specifications are subject to change without notice.
All other registered trademarks, trademarks, and service marks are property of their respective owners.

WAN Module Installation and User Guide iii
Contents
Preface
Introduction -v
Terminology -vi
Conventions -vi
Related Publications -viii
1 Installing the WAN Module
Overview 1-1
Installing the WAN Module 1-2
Ports and Connectors 1-3
Module LEDs 1-4
Installing the WAN Module Software 1-6
2 Configuring the WAN Physical Link
Overview 2-1
Red, Blue, and Yellow Alarms 2-2
Configuring WAN Physical Links 2-2
Cable length 2-3
Clock Source 2-4
Facility Data Link 2-4
Framing 2-4
Inband Loopback Detection 2-5

iv WAN Module Installation and User Guide
Linecoding 2-5
Receiver Gain 2-5
SNMP Alerts 2-5
Timeslots 2-6
Yellow Alarms 2-6
WAN Port Configuration Commands 2-7
Monitoring WAN Physical Links 2-8
Loopback 2-8
Near-end Loopback Modes 2-9
Far-End Loopback Modes 2-11
Enabling Loopback Mode 2-12
Disabling Loopback Mode 2-12
WAN Port Monitoring Commands 2-13
3 Configuring PPP and MLPPP
Overview 3-1
Multilink PPP and Multilink Groups 3-2
Configuring a PPP/MLPPP Link 3-3
Authentication 3-3
PPP Link Username 3-4
PPP User Accounts 3-4
Encapsulation 3-4
PPP/MLPPP Configuration Commands 3-5
Monitoring PPP/MLPPP Links 3-6
PPP/MLPPP Configuration Examples 3-7
Configuring a Bridged PPP/MLPPP Link Example 3-7
Configuring a Routed PPP/MLPPP Link Example 3-8
Industry Canada Certification A-1
FCC Certification A-2
Index
Index of Commands

WAN Module Installation and User Guide v
Preface
This Preface provides an overview of this guide, describes guide conventions, and lists
other publications that may be useful.
Introduction
This guide provides the required information to install the WM-4T1i, WM-4E1i, and
WM-1T3i WAN modules in an Alpine 3800 series switch from Extreme Networks and
perform the initial module configuration tasks.
This guide is intended for use by network administrators who are responsible for
installing and setting up network equipment. It assumes a basic working knowledge of:
•Local area networks (LANs).
•Ethernet concepts.
•Ethernet switching and bridging concepts.
•Routing concepts.
•Internet Protocol (IP) concepts.
•Routing Information Protocol (RIP) and Open Shortest Path First (OSPF).
•Simple Network Management Protocol (SNMP).
If the information in the release notes shipped with your module differs from the
information in this guide, follow the release notes.

vi WAN Module Installation and User Guide
Terminology
When features, functionality, or operation is specific to one of the WAN modules, the
specific module name is used. Explanations about features and operations that are the
same for both of the WAN modules simply refer to the product as the “module.”
Conventions
Table1 and Table 2 list conventions that are used throughout this guide.
Table 1: Notice Icons
Icon Notice Type Alerts you to...
Note Important features or instructions.
Caution Risk of personal injury, system damage, or loss of data.
Warning Risk of severe personal injury.
Table 2: Text Conventions
Convention Description
Screen displays This typeface indicates command syntax, or represents information
as it appears on the screen.
Screen displays
bold
This typeface indicates how you would type a particular command.
The words “enter”
and “type” When you see the word “enter” in this guide, you must type something, and then press the Return or Enter key. Do not press the
Return or Enter key when an instruction simply says “type.”
[Key] names Key names are written with brackets, such as [Return] or [Esc].
If you must press two or more keys simultaneously, the key names
are linked with a plus sign (+). Example:
Press [Ctrl]+[Alt]+[Del].

WAN Module Installation and User Guide vii
Conventions
Words in italicized type Italics emphasize a point or denote new terms at the place where
they are defined in the text.
Table 2: Text Conventions (continued)
Convention Description

viii WAN Module Installation and User Guide
Related Publications
The publications related to this one are:
•ExtremeWare™release notes
•ExtremeWare Software User Guide
•Alpine 3800 Series Switch Hardware Installation Guide
•Alpine Module Installation Note
Documentation for Extreme Networks products is available on the World Wide Web at
the following location:
http://www.extremenetworks.com/

WAN Module Installation and User Guide 1-1
1Installing the WAN Module
This chapter covers the following topics:
•Installing the WAN Module on page 1-2
•Ports and Connectors on page 1-3
•Module LEDs on page 1-4
•Installing the WAN Module Software on page 1-6
Overview
The Extreme Networks WAN modules include four-port T1 or E1 modules that can be
configured to use Multilink PPP to aggregate Ethernet or IP routed traffic across
multiple T1/E1 physical links. The modules also have two general purpose 10/100
Mbps Ethernet ports. WM-4T1i is the designation of the T1 version, and WM-4E1i is the
designation of the E1 version. Also included among the WAN modules is a one-port T3
module, designated WM-1T3i, that uses PPP for its traffic.
The modules also have eight internal loopback ports. The Alpine 3800 switch modules
have hardware queues associated with the output of each port for QoS (rate shaping
and priority queueing). To implement ingress QoS, you needed to use the hardware
queues associated with a second port as a loopback port for ingress QoS.

1-2 WAN Module Installation and User Guide
Installing the WAN Module
Installing the WAN Module
All Alpine ™3800 series switch module cards (SMMi modules and I/O modules) are
hot-swappable. You do not need to power off the system to remove or insert a module
card.
Caution: Service to Alpine modules should be performed by trained service
personnel only. Before installing or removing any components of the system, or
before carrying out any maintenance procedures, read the safety information
provided in Appendix A of the Alpine Hardware Installation Guide.
Warning: You must install blank panels in empty slots to ensure adequate system
cooling.
To remove and replace a module card, follow these steps:
1Prior to removing/installing a module card into the Alpine 3804 or Alpine 3808
chassis, put on the ESD wrist strap that is provided with the chassis, and connect the
metal end to the ground receptacle located on the top-right corner of the Alpine
front panel.
2Loosen the module card by unscrewing the screws using a #2 Phillips-head
screwdriver.
3Rotate the ejector/injector handles to disengage the module card from the backplane.
Note: Blank panels do not have ejector/injector handles, because they do not
engage the backplane. They are secured entirely by the retaining screws. In
addition, the retaining screws are not captive.
4Slide the module card out of the chassis.
5Slide the new module card into the appropriate slot of the chassis (SMMi modules
into the orange slot, I/O modules into Slots 1 through 4 on the Alpine 3804, or Slots
1 through 8 on the Alpine 3808), until it is fully seated in the backplane.
Caution: Ensure that the sheet metal of the module, and not the PCB board,
engages the card cage runners.
As the module begins to seat in the chassis, the ejector/injector handles will begin to
close.
6To secure the module in the chassis, close the ejector/injector handles by pushing
them toward the center of the module card, and tighten the screws using a #2
Phillips-head screwdriver.

WAN Module Installation and User Guide 1-3
Ports and Connectors
Note: Tighten the screws before inserting additional modules. If you insert
additional modules before tightening the screws, you might unseat modules
that you have not secured.
Caution: You can only install I/O modules in the slots labeled Slot 1 through
Slot 4 on the Alpine 3804, or Slot 1 through Slot 8 on the Alpine 3808. Forceful
insertion can damage the I/O module and the connector pins on the backplane.
Ports and Connectors
The WM-4T1i module is shown in Figure 1-1.
Figure 1-1: WM-4T1i Module
The WM-4T1i module has four T1 ports and two general purpose 10/100 Ethernet
ports. The WM-4T1i also has eight internal loopback ports. Internal loopback ports
allow you to configure bi-directional rate-limiting without tying up any of the external
ports for ingress rate shaping. Internal loopback ports are marked with the notation
“iL”when displayed on the command line or with ExtremeWare Vista Web access.
The WM-4E1i module has four E1 ports in place of the T1 ports found in the WM-4T1i
module. It is identical in all other respects.
The WM-1T3i module is shown in Figure 1-2.
38_WM4T1i
Module status
LEDs T1 ports 10/100 Mbps ports

1-4 WAN Module Installation and User Guide
Installing the WAN Module
Figure 1-2: WM-1T3i Module
The WM-1T3i module has one T3 port, consisting of a two BNC connectors, one for the
transmit path and one for the receive path. The module also has two general purpose
10/100 Ethernet ports. Like the other WAN modules, the WM-1T3i also has eight
internal loopback ports.
Module LEDs
The T1/E1 module LEDs are shown in Figure 1-3. The WM-1T3i module LEDs are
similar, but there is only one WAN port LED and the Ethernet port LEDs are numbered
2 and 3.
Figure 1-3: T1/E1 Module LEDs
38_WM1T3i
10/100 Mbps portsModule status
LEDs T3 port
Module reset

WAN Module Installation and User Guide 1-5
Ports and Connectors
Table 1-1 describes the LED behavior on the WAN modules.
The slowly blinking LEDs cycle once per second. The rapidly blinking LEDs cycle twice
a second.
Table 1-1: WAN Module LEDs
LED Color Indicates
Status Off No power
Amber Module seated in chassis
Green Module powered up
Diag Green (blinking) Power-on Self Test (POST) is running
Off Normal operation
WAN port
(1-4)T1/E1
(1)T3
Amber Near-end fault detected (for example, no cable)
Amber (blinking
rapidly) Far-end fault detected
Amber (blinking
slowly) Physical link present, but no higher-layer link established
Green Physical link present, higher-layer link established,
no traffic
Alternating green
and amber Physical link present, higher-layer link established, traffic present
Green (blinking
slowly) Port disabled or unconfigured
Green (blinking
rapidly) Loopback testing mode
10/100 port
(5,6)T1/E1
(2,3)T3
Off No link present
Green Link present
Alternating green
and amber Traffic present

1-6 WAN Module Installation and User Guide
Installing the WAN Module
Installing the WAN Module Software
Once the WAN module is installed in the chassis, you might need to update the image
file on the module. See the release notes for your version of ExtremeWare for details.
(You might also need to update the image on the SMMi to one that will support the
module. See the ExtremeWare Software User Guide for more information on updating the
SMMi image.)
The image file contains the executable code that runs on the module. As new versions
of the image are released, you should upgrade the software running on your module.
The image installed on the SMMi and the image installed on the module must be
compatible. New SMMi images and module images are released together, so if you
upgrade both at the same time, you will be certain to have compatible images. If this is
not feasible, see the Extreme Networks customer support website for compatibility
information.
The image is downloaded from either a Trivial File Transfer Protocol (TFTP) server on
the network or from a PC connected to the serial port using the XMODEM protocol.
Downloading a new image involves the following steps:
•Load the new image onto a TFTP server on your network (if you will be using
TFTP).
•Load a new image onto a PC (if you will be using XMODEM).
•Download the new image to the module using the command
download image slot <slot> [<ipaddress> | <hostname>] <filename>
{primary | secondary}
where the following is true:
slot —Is the slot in which the module is installed.
ipaddress —Is the IP address of the TFTP server.
hostname —Is the hostname of the TFTP server. (You must enable DNS to use this
option. See the ExtremeWare Software User Guide for more information.)
filename —Is the filename of the new image.
primary —Indicates the primary image.
secondary —Indicates the secondary image.

WAN Module Installation and User Guide 1-7
Installing the WAN Module Software
The module can store up to two images; a primary and a secondary. When you
download a new image, you must select into which image space (primary or secondary)
the new image should be placed. If not indicated, the primary image space is used.
You can select which image the switch or module will load on the next reboot by using
the following command:
use image {slot <slot>} [primary | secondary]

1-8 WAN Module Installation and User Guide
Installing the WAN Module

WAN Module Installation and User Guide 2-1
2Configuring the WAN Physical
Link
This chapter covers the following topics:
•Configuring WAN Physical Links on page 2-2
•Monitoring WAN Physical Links on page 2-8
Overview
In this document, WAN refers to either T1, E1, or T3 technologies. T1 is a mature
technology originally developed for voice telephone transmission. It was used to
aggregate a number of voice lines into a single connection to the telephone network.
Today, T1 is also used to transmit digital data using widely available equipment and
established wiring commonly available in diverse locations.
A similar technology standard is in use in Europe, namely E1. T1 and E1 are similar, but
not identical.
Higher bandwidth characterizes T3 connections. Essentially, a T3 connection is
equivalent to a bundle of 28 T1 connections.
This chapter describes the T1, E1, and T3 features that can be configured in the WAN
module software.

2-2 WAN Module Installation and User Guide
Configuring the WAN Physical Link
Red, Blue, and Yellow Alarms
WAN links have error detection built into the link hardware. The hardware can detect
different types of errors, labeled red, blue and yellow alarms.
A red alarm occurs when the signal is lost or an out of frame error occurs. An out of
frame error can be caused when the framing type configured for the local interface does
not match the framing type of the incoming signal or when the incoming signal does
not contain a framing pattern.
A yellow alarm is also called a Remote Alarm Indication (RAI). When the remote end of
a link does not receive a signal, it will transmit a yellow alarm signal back to the local
end.
A blue alarm is also called an Alarm Indication Signal (AIS). A blue alarm indicates that
a device somewhere upstream has experienced a loss of signal.
Alarms affecting a link can be viewed by using one of the show commands, for
example, show ports t1 alarms.
Configuring WAN Physical Links
There are a number of parameters that can be configured for a WAN link. If you have
control of both sides of the link, then the default configuration is probably the best
choice. If you must connect to a line controlled by another organization, you will need
to configure the line to correspond with the settings at the other end. Some parameters
are only configurable, or only apply to some of the WAN link types. The following list
of parameters also displays which types of WAN links allow you to configure that
parameter:
•Cable length (T1, T3)
•Clock Source (T1, E1, T3)
•Facility Data Link (T1)
•Framing (T1, E1, T3)
•Inband Loopback Detection (T1)
•Linecoding (T1)
•Receiver Gain (E1)
•SNMP Alerts (T1, E1, T3)

WAN Module Installation and User Guide 2-3
Configuring WAN Physical Links
•Timeslots (E1)
•Yellow Alarms (T1)
Cable length
Longer cable lengths cause greater losses for signals, so transmitter hardware must
transmit at a higher level to transmit data successfully. However, too high a signal level
can cause crosstalk from one cable to another. The cablelength parameter allows you to
control the transmitter signal level for your conditions. Typically, your service provider
will suggest the correct level.
The parameter values available differ for T1 and T3 links. For E1, the parameter value is
not changeable, but is always set to 120 Ohms. However, for E1 links you can configure
the receiver gain to meet your conditions. See the section Receiver Gain on page 2-5.
For short haul connections (less than 1000 feet) the typical equipment uses less sensitive
receivers. The transmitter level for T1 is set by selecting a cable length in feet, from the
following values: 133, 266, 399, 533 or 655. For T3, select from the following values: 249
or 900. Choose the next higher value if the cable length provided by your service
provider does not match one of these values. For example, choose 133 for a 50 foot cable
and 533 for a 450 foot cable. The default value is 133, which corresponds to cables in the
range of 0-133 feet.
For longer distances (up to 6000 feet) T1 equipment uses more sensitive receivers, and
crosstalk is more likely to occur. Under these conditions, the transmitter level is set by
selecting a transmitter attenuation level in dB from the following values: -22.5, -15, -7.5,
or 0.
From lowest to highest transmitter level, use the following values for the config port
t1 cablelength command: -22.5 db, -15 db, -7.5 db, 0 db, 133 feet, 266 feet, 399 feet,
533 feet, and 655 feet.
To configure the cable length, use one of the following commands:
config ports <portlist> t1 cablelength [0 | -7.5 | -15 | -22.5] db
config ports <portlist> t1 cablelength [133 | 266 | 399 | 533 | 655]
feet
config ports <portlist> t3 cablelength [249 | 900] feet

2-4 WAN Module Installation and User Guide
Configuring the WAN Physical Link
Clock Source
A clock is used to synchronize data transmission on the line. Generally, one end of the
link provides the master clock, and the other end of the link recovers the clock from the
signal on the line. By default the clock source is derived from the line. If needed, an
internal clock is available. To configure the clock source, use the following command:
config ports <portlist> [t1 | e1 | t3] clocksource [internal | line]
Note: If the clock source is configured as “line”, but the clock cannot be
recovered from the signal on the line, the hardware will use the internal clock
instead.
Facility Data Link
Facility data link (FDL) for T1 links uses twelve bits in the ESF frame to signal
information about line and connection status. Since FDL is only meaningful for ESF
framing, FDL settings are ignored when a port is configured for SF framing. See
“Inband Loopback Detection”for information on configuring framing.
The two T1 standards supported for FDL are ATT, described by the ATT 54016
specification, and ANSI, described by the T1.403 standard. The default value is off. To
configure FDL, use the following command:
config ports <portlist> t1 fdl [off | att | ansi]
Framing
Framing is used to synchronize data transmission on the line. Framing allows the
hardware to determine when each packet starts and ends. The two choices for T1
framing are Super Frame (SF), also known as D4, and Extended Super Frame (ESF). The
ESF scheme is a newer standard and is enabled by default. To choose the T1 framing
scheme, use the following command:
config ports <portlist> t1 framing [esf | sf]
If you choose to use SF framing, you should disable yellow alarm detection for the T1
line. SF framing may generate false yellow alarms. See “Yellow Alarms”on page 2-6 for
more details.
The framing choices for E1 are CRC4 or no-CRC4. To choose the E1 framing scheme,
use the following command: