Cabletron Systems MicroMMAC 22ES Manuale utente

Title Page

ICRO

MMAC

LOCAL MANAGEMENT

ROUTING ADDENDUM

MicroMMAC Local Management Routing Addendum i

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.



Printed in the United States of America

Order Number: 9032262 June 1997

Cabletron Systems

and

MicroMMAC

are

registered trademarks of Cabletron Systems, Inc.

All other product names mentioned in this manual may be trademarks or registered trademarks of

their respective companies.

Printed on Recycled Paper

Notice

ii MicroMMAC Local Management Routing Addendum

MicroMMAC Local Management Routing Addendum iii

CONTENTS

1.0 Introduction..................................................................................... 1

1.1 Local Management Overview......................................................... 1

2.0 M

ICRO

MMAC Protocol Support....................................................... 2

2.1 WAN Protocols............................................................................... 2

2.2 Data Compression.......................................................................... 2

2.3 Bridging and Routing...................................................................... 3

2.3.1 MicroMMAC Bridging and Routing .................................... 4

2.4 Protocol Filtering............................................................................. 5

3.0 M

ICRO

MMAC Local Management................................................... 7

3.1 Local Management Organization.................................................... 7

3.2 Router Setup Screen...................................................................... 8

3.2.1 The IP/IPX Screen Fields .................................................. 8

3.3 IP Router Setup Screen.................................................................. 9

3.3.1 The IP Router Setup Screen Fields................................. 10

3.4 The IP General Config Screen ..................................................... 10

3.4.1 IP General Configuration Status Fields ........................... 11

3.4.2 IP General Configuration Fields....................................... 12

3.4.3 Selecting a Port for Configuration.................................... 13

3.4.4 Entering the IP Address and Subnet Mask...................... 13

3.4.5 Selecting the Frame Type for a Port................................ 14

3.4.6 Setting the Maximum Transmission Unit (MTU).............. 14

3.4.7 Enabling IP Routing Services on a Port........................... 15

3.4.8 Enabling IP Forwarding on a Port.................................... 15

3.4.9 Configuring the UDP Broadcast Redirector..................... 16

3.4.10 Enabling Proxy ARP on a Port......................................... 17

3.4.11 Configuring the Network Broadcast Type on a Port ........ 18

3.4.12 Enabling the RIP Routing Protocol on a Port................... 19

3.5 IPX Router Setup Screen............................................................. 20

3.5.1 The IPX Router Setup Fields........................................... 21

3.6 The IPX General Configuration Screen........................................ 22

3.6.1 IPX General Configuration Status Fields......................... 22

3.6.2 IPX General Configuration Fields .................................... 23

INDEX

Contents

iv MicroMMAC Local Management Routing Addendum

MicroMMAC Local Management Routing Addendum 1

1†22†

1.0 INTRODUCTION

Welcome to Cabletron Systems

MicroMMAC Local Management Routing

Addendum.

The purpose of this document is to assist the user to conﬁgure

the MicroMMac for routing. Use this document as a guide in Local

Management routing.

The MicroMMAC Kit (Part Number MicroE-W6RS-LIC) contains the

memory and ﬁrmware to upgrade the operating system of the

MicroMMAC. The MicroMMAC Kit contains the following items:

• 8 MB Local DRAM SIMM

• Memory Installation Sheet

• MicroMMAC Local Management Routing Addendum

• Release Notes for the IP/IPX routing Firmware (v. 2.00.04 or higher)

• Diskettes with Firmware version 2.00.04 or higher

• License Agreement

•

Read Me First

notice

Be sure to read the

Memory Installation Sheet

and the Release Notes

contained in the kit as well as this

MicroMMAC Local Management

Routing Addendum.

Also refer to

the

MicroMMAC Local Management

User’s Guide

shipped with the MicroMMAC.

1.1 LOCAL MANAGEMENT OVERVIEW

Cabletron Systems Local Management is a management tool that allows a

network manager to perform the following tasks:

• Conﬁgure interconnected devices to form a network.

• Monitor the performance of the network.

• Control user access to the network and its components for the purpose

of security.

ICRO

MMAC Protocol Support

2 MicroMMAC Local Management Routing Addendum

2.0 M

ICRO

MMAC PROTOCOL SUPPORT

The following sections discuss protocol support on the MicroMMAC

including WAN protocols, data compression, bridging and routing, and

protocol ﬁltering.

2.1 WAN PROTOCOLS

The MicroMMAC, with a BRIM-W6 installed, supports the following

WAN protocols over the WAN port:

• Point-to-Point Compression Control Protocol (CCP) as deﬁned by

RFC 1962

• Point-to-Point Protocol (LCP) as deﬁned by RFC 1661

• Point-to-Point Protocol (BNCP) as deﬁned by RFC 1638

• Point-to-Point Protocol (IPCP) as deﬁned by RFC 1473

• Point-to-Point Protocol (IPXCP) as deﬁned by RFC 1552

• Frame Relay as deﬁned by RFC 1490

• Frame Relay Data Compression Protocol (DCP) as deﬁned by FRF.9

PPP (Point-to-Point Protocol) is a data link layer industry standard WAN

protocol for transferring multi-protocol data trafﬁc over point-to-point

connections. With this protocol, options such as security and network

protocols can be negotiated by the connected devices.

Frame Relay is a packet-switching data communications protocol that

statistically multiplexes many data transmissions over a single

transmission link.

2.2 DATA COMPRESSION

The STAC Electronics Stacker LZS Compression Protocol is supported

over PPP and Frame Relay providing up to 4:1 data compression. Data

compression is supported for each WAN interface for line speeds of up to

256 Kbps. To use data compression, compatible equipment (such as the

MicroMMAC) must be in use at both ends of the WAN link.

Bridging and Routing

MicroMMAC Local Management Routing Addendum 3

2.3 BRIDGING AND ROUTING

Bridging —

Bridging creates separate segments on a network. The

bridge examines a portion of each network frame called the header. This

header contains control information for the frame. The bridge compares

the destination address of the frame to a table of source addresses. If the

address indicates that the sending station and the destination station are

on the same side of the bridge, the frame is discarded. If the addresses do

not indicate that, then the bridge forwards the frame to its other

interface(s).

During this process, the bridge formulates a table that allows it to identify

which stations are connected to which LAN segment. The destination

addresses of received frames are compared to this address table and

decisions are made to discard or forward based on the outcome.

Transparent bridging allows locally connected devices to send frames to

all devices as if they are all on the same LAN.

Bridging allows frames to be sent to all destinations regardless of the

network protocols used. It also allows protocols that cannot be routed

(such as NETBIOS) to be forwarded, and optimizes internetwork capacity

by localizing trafﬁc on LAN segments. A bridge extends the physical

reach of networks beyond the limits of each LAN segment. Filters are

used to increase network security in bridged networks.

Routing —

Routing provides a way to transfer user data from source to

destination over different LAN and WAN links using one or more

network protocol formats. Routing relies on routing address tables to

determine the best path for each packet. Routing tables can be seeded

(i.e., addresses for remote destinations are placed in the table along with

network address masks and a metric for path latency). Routing tables are

also built dynamically (i.e., the location of remote stations, hosts and

networks are updated from broadcast packet information). Routing helps

to increase network capacity by localizing trafﬁc on LAN segments and

reducing the amount of broadcasts that would result from bridged trafﬁc.

It also provides security by isolating trafﬁc on segmented LANs. Routing

extends the reach of networks beyond the limits of each LAN segment.

ICRO

MMAC Protocol Support

4 MicroMMAC Local Management Routing Addendum

2.3.1 MicroMMAC Bridging and Routing

The MicroMMAC can operate as a bridge, a router, or both. The

MicroMMAC operates as a router for network protocols that are

supported when routing is enabled and operates as a bridge when bridging

is enabled. When both bridging and routing are enabled, routing takes

precedence over bridging, i.e., the MicroMMAC uses the protocol address

information of the packet to route the packet to the correct destination.

However, if the protocol is not supported, the MicroMMAC operates as a

bridge and uses the MAC address information to send the packet.

Operation of the MicroMMAC is inﬂuenced by routing and bridging

controls and ﬁlters set during MicroMMAC conﬁguration. General IP

routing, and routing or bridging from speciﬁc remote routers are controls

set during the conﬁguration process.

IEEE 802.1d Bridging —

The MicroMMAC supports the IEEE 802.1d

standard for LAN to LAN bridging. Bridging is provided over PPP as

well as adjacent LAN ports. The bridging software uses transparent

bridging. When the MicroMMAC is conﬁgured as a bridge, the unit

bridges data packets to the destination, regardless of the network

protocols used.

The MicroMMAC uses the Spanning Tree Algorithm to provide bridging

redundancy while preventing data loops and duplicate data. This is a

self-learning bridge, i.e., the bridge builds and updates an address table

with each MAC source address and associated information when the

packets are received.

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