Cabletron Systems SmartSTACK ELS10-27MDU Installation and operating instructions

9033276
ELS10-27MDU
User’s Guide Addendum

i
Notice
Notice
Cabletron Systems reserves the right to make changes in specifications and other information
contained in this document without prior notice. The reader should in all cases consult
Cabletron Systems to determine whether any such changes have been made.
The hardware, firmware, or software described in this manual is subject to change without
notice.
IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL,
INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING
BUT NOT LIMITED TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS
MANUAL OR THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS
HAS BEEN ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF
SUCH DAMAGES.
Cabletron Systems, Inc.
35 Industrial Way
Rochester, NH 03867
©February 2000 by Cabletron Systems, Inc.
All Rights Reserved
Printed in the United States of America
Order Number: 9033276
Cabletron is a registered trademark and SmartStack is a trademark of Cabletron Systems, Inc.

Notice
ii
FCC Notice
This device complies with Part 15 of the FCC rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.
NOTE: This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment uses, generates, and can radiate radio frequency
energy and if not installed in accordance with the operator’s manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is
likely to cause interference in which case the user will be required to correct the interference at
his own expense.
WARNING: Changes or modifications made to this device which are not expressly approved
by the party responsible for compliance could void the user’s authority to operate the
equipment.
VCCI Notice
This is a Class A product based on the standard of the Voluntary Control Council for
Interference by Information Technology Equipment (VCCI). If this equipment is used in a
domestic environment, radio disturbance may arise. When such trouble occurs, the user may
be required to take corrective actions.

iii
Notice
Industry Canada Notice
This digital apparatus does not exceed the Class A limits for radio noise emissions from digital
apparatus set out in the Radio Interference Regulations of the Canadian Department of
Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques de la class A prescrites dans le Règlement sur le
brouillage radioélectrique édicté par le ministère des Communications du Canada.

Notice
iv
DECLARATION OF CONFORMITY
Application of Council Directive(s): 89/336/EEC
73/23/EEC
Manufacturer’s Name: Cabletron Systems, Inc.
Manufacturer’s Address: 35 Industrial Way
PO Box 5005
Rochester, NH 03867
European Representative Name: Mr. J. Solari
European Representative Address: Cabletron Systems Limited
Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG14 2PZ, England
Conformance to Directive(s)/Product Standards: EC Directive 89/336/EEC
EC Directive 73/23/EEC
EN 55022
EN 50082-1
EN 60950
Equipment Type/Environment: Networking Equipment, for use in a
Commercial or Light Industrial Environment.
We the undersigned, hereby declare, under our sole responsibility, that the equipment
packaged with this notice conforms to the above directives.
Manufacturer Legal Representative in Europe
Mr. Ronald Fotino Mr. J. Solari
___________________________________ ___________________________________
Full Name Full Name
Compliance Engineering Manager Managing Director - E.M.E.A.
___________________________________ ___________________________________
Title Title
Rochester, NH, USA Newbury, Berkshire, England
___________________________________ ___________________________________
Location Location

v
Contents
Introduction............................................................................................................................................1
Product Overview .................................................................................................................................1
Configuring the ELS10-27MDU ..........................................................................................................3
Additional Commands...........................................................................................................3
Address Limiting.............................................................................................................3
Trapcontrol........................................................................................................................3
VLANs on the ELS10-27MDU.............................................................................................................4
Configuring VLAN ...............................................................................................................................7
Adding a VLAN......................................................................................................................7
Deleting a VLAN.....................................................................................................................7
Database Requirements........................................................................................................................8
Non-Supported Features........................................................................................................9

vi
Contents

9033276 1
Introduction
This addendum introduces the ELS10-27MDU. It explains the default
configuration and provides the user with the necessary information to
manage and configure this switch. This addendum is provided in
conjunction with the ELS10-27TX User Guide, and does not repeat the
information found in that document. The user should refer to the
ELS10-27TX User Guide for basic switch installation, management and
technical information.
Product Overview
The ELS10-27MDU is a 24 port 10BASE-T switch with three Fast Ethernet
ports. It is a specially modified version of the ELS10-27TX, designed to
provide Internet access in Multiple Dwelling Units (MDUs), such as
hotels, apartment buildings, and dormitories. The ELS10-27MDU has
unique firmware, designed forproduct installationin MDU environments,
in which security and restriction of data traffic between user ports are the
primary considerations. This is accomplished by using the special VLAN
configuration features of the switch.
The default configuration of the ELS10-27MDU is designed to limit traffic
between the ports for purposes of security. This configuration may be
modified as needed. There are 24 10BASE-T ports (user ports), and 3 Fast
Ethernet ports (ports 25, 26 and 27). Port 27 is the uplink port, and Ports 25
and 26 are downlink ports. The downlink ports pass traffic only to an
uplink port, and similarly the uplink port passes traffic only to a downlink
port (or to the user ports on that switch) when multiple ELS10-27MDU
switches are cascaded. The uplink port at the highest level in a cascaded
configuration of switches would typically be connected to a router with a
connection to the Internet. Security is provided by restricting traffic as
follows:

Product Overview
29033276
• Traffic only passes between the 10Mbps ports and the single 100Mbps
uplink port
• Traffic only passes between the 100Mbps downlink port(s) and the
single 100Mbps uplink port on another ELS10-27MDU switch in a
cascaded configuration
• Traffic is inhibited from passing between 10Mbps ports
• Traffic is inhibited from passing between the 10Mbps ports and the
100Mbps downlink ports
• All IP packets not received on the uplink port are ignored
Figure 1 shows a sample configuration with seven ELS10-27MDU
cascaded in three layers.
Figure 1. Sample ELS10-27MDU Configuration
18X
PORTSTATUS MODE
FDX
COLRX 100
ACTTX
USR
MON
10X6X4X2X 8X 12X 14X 16X 22X20X 24X 25X 26X 27X 27
26
EPIM100
LINK
STATUS
STATUS STATUS STATUS
STATUS
STATUS
STATUS STATUS STATUS STATUS STATUS STATUS
STATUS STATUS STATUS
RESET
COM
CPU
PWR STATUS
LINK
LINK LINK LINK
LINK LINK LINK LINK LINK LINK
LINK
LINK LINK LINK
DOWNLINKS
10/100BASE TX
UPLINK
10/100BASE TX
LNK
LNK
24 User
Ports
18X
PORTSTATUS MODE
FDX
COLRX 100
ACTTX
USR
MON
10X6X4X2X 8X 12X 14X 16X 22X20X 24X 25X 26X 27X 27
26
EPIM100
LINK
STATUS
STATUS STATUS STATUS
STATUS
STATUS
STATUS STATUS STATUS STATUS STATUS STATUS
STATUS STATUS STATUS
RESET
COM
CPU
PWR STATUS
LINK
LINK LINK LINK
LINK LINK LINK LINK LINK LINK
LINK
LINK LINK LINK
DOWNLINKS
10/100BASE TX
UPLINK
10/100BASE TX
LNK
LNK
18X
PORTSTATUS MODE
FDX
COLRX 100
ACTTX
USR
MON
10X6X4X2X 8X 12X 14X 16X 22X20X 24X 25X 26X 27X 27
26
EPIM100
LINK
STATUS
STATUS STATUS STATUS
STATUS
STATUS
STATUS STATUS STATUS STATUS STATUS STATUS
STATUS STATUS STATUS
RESET
COM
CPU
PWR STATUS
LINK
LINK LINK LINK
LINK LINK LINK LINK LINK LINK
LINK
LINK LINK LINK
DOWNLINKS
10/100BASE TX
UPLINK
10/100BASE TX
LNK
LNK
18X
PORTSTATUS MODE
FDX
COLRX 100
ACTTX
USR
MON
10X6X4X2X 8X 12X 14X 16X 22X20X 24X 25X 26X 27X 27
26
EPIM100
LINK
STATUS
STATUS STATUS STATUS
STATUS
STATUS
STATUS STATUS STATUS STATUS STATUS STATUS
STATUS STATUS STATUS
RESET
COM
CPU
PWR STATUS
LINK
LINK LINK LINK
LINK LINK LINK LINK LINK LINK
LINK
LINK LINK LINK
DOWNLINKS
10/100BASE TX
UPLINK
10/100BASE TX
LNK
LNK
24 User
Ports
24 User
Ports
24 User
Ports
18X
PORTSTATUS MODE
FDX
COLRX 100
ACTTX
USR
MON
10X6X4X2X 8X 12X 14X 16X 22X20X 24X 25X 26X 27X 27
26
EPIM100
LINK
STATUS
STATUS STATUS STATUS
STATUS
STATUS
STATUS STATUS STATUS STATUS STATUS STATUS
STATUS STATUS STATUS
RESET
COM
CPU
PWR STATUS
LINK
LINK LINK LINK
LINK LINK LINK LINK LINK LINK
LINK
LINK LINK LINK
DOWNLINKS
10/100BASE TX
UPLINK
10/100BASE TX
LNK
LNK
18X
PORTSTATUS MODE
FDX
COLRX 100
ACTTX
USR
MON
10X6X4X2X 8X 12X 14X 16X 22X20X 24X 25X 26X 27X 27
26
EPIM100
LINK
STATUS
STATUS STATUS STATUS
STATUS
STATUS
STATUS STATUS STATUS STATUS STATUS STATUS
STATUS STATUS STATUS
RESET
COM
CPU
PWR STATUS
LINK
LINK LINK LINK
LINK LINK LINK LINK LINK LINK
LINK
LINK LINK LINK
DOWNLINKS
10/100BASE TX
UPLINK
10/100BASE TX
LNK
LNK
18X
PORTSTATUS MODE
FDX
COLRX 100
ACTTX
USR
MON
10X6X4X2X 8X 12X 14X 16X 22X20X 24X 25X 26X 27X 27
26
EPIM100
LINK
STATUS
STATUS STATUS STATUS
STATUS
STATUS
STATUS STATUS STATUS STATUS STATUS STATUS
STATUS STATUS STATUS
RESET
COM
CPU
PWR STATUS
LINK
LINK LINK LINK
LINK LINK LINK LINK LINK LINK
LINK
LINK LINK LINK
DOWNLINKS
10/100BASE TX
UPLINK
10/100BASE TX
LNK
LNK
24 User
Ports
24 User
Ports
To Internet
24 User
Ports

Configuring the ELS10-27MDU
9033276 3
Configuring the ELS10-27MDU
The ELS10-27MDU may be managed by the Local Console or over the
uplink port (port 27). If using the uplink port, an IP address is required. In
the default configuration, port 27 is in the 0x01C VLAN. To Assign an IP
address to this port, type:
ipaddr [IP-ADDRESS [NETWORK-MASK]] 0x01C
Additional Commands
The ELS10-27TX User Guide details the various commands that are
available through the Local Console or management port. The following
additional commands have been added to the ELS10-27MDU:
Address Limiting
Address Limiting is the ability to configure a limit, on a per port basis, on
the number of end user devices that have connectivity from a single port.
The command for Address Limiting is part of the enable command set. To
activate Address Limiting, type:
enable [PORT-RANGE [RIP] [TransmitPacing] [ADDRESS_LIMIT]]
The default is no limit. The user can set the limit on a "per port" basis.
Setting the limit to zero allows unlimited access. Enabling a port without
setting a limit will remove any limit that was previously set.
Trapcontrol
Trap Control is setting the IP address for traps. To activate, type:
trapcontrol [on | off] [IPADDR]
The IP address can be changed whenever traps are turned on or off.
Setting the IP address to 0.0.0.0 removes the address.

VLANs on the ELS10-27MDU
49033276
VLANs on the ELS10-27MDU
IEEE 802.1Q is a standard for virtual bridged local area networks
(VLANs). It provides an alternate method for forwarding packets through
a switch. In an 802.1D (Spanning Tree) bridge, packets are forwarded in
accordance with the spanning tree as dynamically created by the 802.1D
protocol Bridge Protocol Data Units (BPDUs), and the spanning tree state
of each port. In 802.1Q, in addition to spanning tree, packets are
forwarded in accordance with a VLAN tag that is embedded in the packet,
and the set of ports registered for that VLAN. A set of rules is used for
ingress (receipt), forwarding, and egress (transmit).
The ELS10-27MDU provides support for port based VLANs.
The ingress rules deal with the reception of tagged and untagged packets
and the decision to either drop them, or forward them to the forwarding
process.
The forwarding rules deal with forwarding packets utilizing topology
restrictions, the filtering database, queue frames (not supported), map
priorities (not supported), and recalculation of the FCS. The forward/
filtering database can contain three types of entries:
• Permanent entries
• Static entries
• Dynamic entries
Dynamic entries are created by the protocols supported by the switch
(GVRP). There will be no learning of VLANs outside of this protocol.
The egress rules deal with whether the destination port(s) are members of
the VLAN, and whether the VLAN tag is to be stripped.
802.1Q does NOT replace 802.1D, but limits the relaying of packets on the
spanning tree to a subset. The subset being the members of a particular
VLAN. This is determined by comparing the VLAN ID, which is held
within the tag, to the ports which are members of that VLAN. The
maximum number of VLANs supported in 802.1Q is 32.

VLANs on the ELS10-27MDU
9033276 5
The ELS10-27MDU supports some 802.1Q VLAN capabilities. Static
capabilities are provided. GVRP is not supported at this time.
The ELS10-27MDU operates in 802.1Q mode only. All ports are configured
as access ports. When a packet is received, an 802.1Q tag is inserted into
the packet. This tag and the MAC address are used to forward the packet.
Only ports that are members of this VLAN may receive the packet.
Each of the 10Mbps ports is a separate VLAN with only the CPU and the
100Mbps uplink port as members of this VLAN. When packets are
received on the 10Mbps ports, they can only be forwarded to the CPU
and/or the 100Mbps uplink. The 100Mbps downlinks are configured the
in the same manner. This restricts traffic between the uplink and
downlinks.
The 100Mbps uplink is a member of all the 10Mbps ports VLANs, and also
has its own VLAN, with all the 10Mbps ports as members. The default
VLAN id for a port is its port number plus one as shown in Table 1. The
VLAN id of one is reserved.
Table 1. VLAN ID for the ELS10-27MDU Ports
Port # Default
VLAN ID Description
1 0x2 10Mbps port - user
2 0x3 10Mbps port - user
3 0x4 10Mbps port - user
4 0x5 10Mbps port - user
5 0x6 10Mbps port - user
6 0x7 10Mbps port - user
7 0x8 10Mbps port - user
8 0x9 10Mbps port - user
9 0xA 10Mbps port - user

VLANs on the ELS10-27MDU
69033276
10 0xB 10Mbps port - user
11 0xC 10Mbps port - user
12 0xD 10Mbps port - user
13 0xE 10Mbps port - user
14 0xF 10Mbps port - user
15 0X10 10Mbps port - user
16 0x11 10Mbps port - user
17 0x12 10Mbps port - user
18 0x13 10Mbps port - user
19 0x14 10Mbps port - user
20 0x15 10Mbps port - user
21 0x16 10Mbps port - user
22 0x17 10Mbps port - user
23 0x18 10Mbps port - user
24 0x19 10Mbps port - user
25 0x1A 100Mbps port - downlink
26 0x1B 100Mbps port - downlink
27 0x1C 100Mbps port - uplink
Table 1. VLAN ID for the ELS10-27MDU Ports (Continued)
Port # Default
VLAN ID Description

Configuring VLAN
9033276 7
Configuring VLAN
The ELS10-27MDU is pre-configured when shipped. Each of the 10Mbps
ports is a separate VLAN with only the CPU and the 100Mbps uplink port
as members of this VLAN. This provides for maximum security in a
Multiple Dwelling Unit environment. The VLAN configuration may be
changed, however, to suit different needs.
Adding a VLAN
To create a new VLAN, type:
vlan [add PORT-RANGE NAME VLAN-ID [IPADDR] [IPMASK]]
The port range is a number from 1 to 27.
The Name can be up to 32 ascii characters (optional).
The VLAN-ID is the hexidecimal id number. Pre-configured VLANs are
0x001 through 0x01c.
The IPADDR is the IP address of the unit to be added.
The IPMASK is the IP mask for the IP addresses.
Deleting a VLAN
To delete a VLAN, type:
vlan [del[ete] PORT-RANGE {NAME | VLAN-ID}]
The port range is a number from 1 to 27.
The NAME | VLAN-ID identifies the VLAN to be deleted either by ascii
character name or by hexidecimal id number.

Database Requirements
89033276
Database Requirements
The ELS10-27MDU supports a maximum of 2,048 possible database
entries. Under the default configuration, 559 of these entries are used by
the system, leaving 1,489 entries available for learning. With the first
conversation requiring 29 database entries, and each additional
conversation requiring 2 entries, a maximum of 730 conversations can take
place simultaneously without flooding. This becomes important as
multiple ELS10-27MDU switches are cascaded. (See Figure 1 for an
example of cascaded switches.) For example, if there is one client
connected to each of the 10Mbps ports, a hierarchy consisting of three
ELS10-27MDU switches could involve 72 simultaneous conversations.
Based on a balanced topology of cascaded switches, Table 2 shows that a
maximum of 5 levels could be achieved without flooding taking place, and
the percentage of supported simultaneous conversations at different levels
of cascaded switches, assuming all user ports are active.
Table 2. Database Entries
Number of
Levels Number of Switches Number of Active Users Percent Supported
1 1 24 100
2 3 72 100
3 7 168 100
4 15 360 100
5 31 744 100
663151249.3
7 127 3048 23.9

Database Requirements
9033276 9
Non-Supported Features
The specialized firmware of the ELS10-27MDU has been designed for use
in a secure multi-dwelling unit environment, for which certain features of
the ELS10-27TX are not desired. The latest ELS10-27MDU release notes
should be reviewed to determine if any functionality support has changed
or is not supported.