Enterasys SmartSwitch 2H252 Manuel du propriétaire

9033559-01

IP TOS Supplement

for Local Management

User’s Guides

NOTICE

Enterasys Networks and its licensors reserve the right to make changes in specifications and other information contained

in this document without prior notice. The reader should in all cases consult Enterasys Networks 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 ENTERASYS NETWORKS AND ITS LICENSORS 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 ENTERASYS

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OF SUCH DAMAGES.

Enterasys Networks, Inc.

35 Industrial Way

Rochester, NH 03866-5005

Enterasys Networks, Inc. is a subsidiary of Cabletron Systems, Inc.

2000 by Enterasys Networks, Inc.

Printed in the United States of America

Order Number: 9033559-01 October 2000

Enterasys Networks, MATRIX, and SmartSwitch are trademarks of Enterasys Networks or its licensors.

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

companies.

Overview

This supplement provides information concerning the IP TOS Rewrite feature added to the Priority

Classification Configuration screen. This information applies to the following:

•2nd and 3rd generation devices with firmware revision 4.07.xx and higher

•SmartSwitch 9000 series 9x5xx devices with firmware revision 1.07.xx and higher

This supplement supersedes the information in the Priority Classification Configuration section in

the following documents:

•SmartSwitch Series 2E253, 2H252, 2H253 and 2H258 Local Management User’s Guide

(9033069)

•MATRIX E7 Series and SmartSwitch 6000 Series Modules (6x2xx and 6x3xx) Local

Management User’s Guide (9034046-02)

•SmartSwitch 9000 9x5xx-Series Local Management User’s Guide (9033130-05)

1.0 IP TOS REWRITE FEATURE

The Type of Service (TOS) field [also known as the Differential Services (DF) field in RFC 2474]

is an 8-bit field. It is located in the IP packet and used by a device to indicate the precedence or

priority of a given frame (see Figure 1). The TOS layer-3 priority indicator enables the ability to

signal the frame priority from end to end as the frame makes its way through the network.

Figure 1 Datagram, Layer 2 and Layer 3

NOTE:

“2nd generation devices” refers to the 2x2xx standalone and 6x2xx module series

devices of the SmartSwitch 6000 family.

“3rd generation devices” refers to the 6x3xx series modules devices of the SmartSwitch

6000/Matrix E7 family.

Destination

Address

(DA)

Source

Address

(SA)

VLAN

Priority

Type of

Service

(8-bits)

3559_1

Layer 2 Layer 3

Addr

Length

Version

VLAN

Priority

Type of

Service

(8-bits)

This IP TOS Rewrite feature enables a Network Administrator to assign Layer 3 TOS

characteristics to incoming frames and set the switch to rewrite the 8-bit TOS value in the Layer 3

information portion of incoming frames.

The SmartSwitch/Matrix products enable you to configure the switch to:

•Insert a user-defined 8-bit value into the layer-3 TOS field.

•Write over an existing TOS value. This is useful when the Network Administrator wants to

enforce a specific priority policy in the network.

The IP TOS Rewrite parameters are set using the Priority Classification Local Management

screen. The screen has been updated to allow you to configure the new IP TOS field for any IP

frame classification. A selection field is displayed for all supported classification rules. The default

value is “NO CHANGE”. You can optionally specify TOS=PID, whereby the precedence sub-field

in the TOS field to match the value of the priority in the classification rule. You can also specify a

CUSTOM TOS value between 0 and 255. This allows you to specify an IP TOS value for a

particular need.

2.0 PRIORITY CLASSIFICATION CONFIGURATION SCREEN

When to Use

To perform the following functions:

•Display the current Priority, Classification, and Description entries of each classification rule.

•Assign priorities according to Classification Rules.

•Add/delete a priority and associated protocol entry.

•Access the Protocol Port Configuration screen.

•Assign an 8-bit TOS (also known as DF) value to incoming IP frames.

•Write over an existing TOS value.

When a frame is received that already contains an 802.1Q frame tag, frame classification is not

implemented. Instead, the frame is processed by the SmartSwitch according to the information

contained in the 802.1Q frame tag.

How to Access

Use the arrow keys to highlight the PRIORITY CLASSIFICATION CONFIGURATION menu

item in the 802.1p Configuration Menu screen and press ENTER. The Priority Classification

Configuration screen, Figure 2, displays.

Screen Example

Figure 2 Priority Classification Configuration Screen

Field Descriptions

Refer to Table 1 for a functional description of each screen field.

Table 1 Priority Classification Configuration Screen Field Descriptions

Use this field … To…

PID

(Selectable) – top of

screen

Display the Priority Identifiers (PIDs) currently associated with

protocol classifications. To see which ports are assigned to a

PID/Classification, or to add/remove a port from a PID/Classification,

used in the Protocol Port Configuration screen.

Classification

(Selectable) – top of

screen

Display the classification associated with the priority in the PID

column, which may be selected to call up the Protocol Port

Configuration screen.

Description

(Selectable) – top of

screen

Provide a brief description of the classification.

30793_97w

RETURN

EXIT

Description

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ADD

IP: 123.123.030.006 Mask: 255.255.255.255.255

IP: 123.123.030.007 Mask: 255.255.255.255.255

0x8137

0x0800

0x9999

PID Classification

 

7 Bilateral IP Address

6 Dest IP Address

1 Ethernet II Type

5 802.3 SAP

PREVIOUS NEXTDEL ALL

Classification Rule

PID: CLASSIFICATION: IP ADDRESS: MASK:

5 [ Bil IP Address ] 123.123.030.006 255.255.255.255.255

New IP TOS: [NO CHANGE]

PID

(Modifiable) –

bottom of screen

Enter the priority value that will be associated with the classification

selected in the Classification field. A PID from 0 to 7 may be typed

into the field, where 0 is the lowest priority and 7 is the highest priority.

Classification

(Selectable) – bottom

of screen

Select the classification that will be associated with the priority

selected in the PID field. There can be up to three fields involved

depending on the classification selected. At the time of this printing,

the selections available in each field are listed in Table 2.

NOTE: Besides the PID selected, the order in which a frame is

transmitted also depends on the Classification Precedence

Rules discussed in Section 2.1. These rules come into effect

when there are multiple classifications configured in the

SmartSwitch.

ADD

(Toggle) – bottom of

screen

Add the current Classification Rule (PID and Classification selections)

to the screen.

DEL ALL/DEL

MARKED

(Toggle) – bottom of

screen

Delete all or one or more marked entries, simultaneously. The DEL

ALL command is the default and it is used to simultaneously delete all

the configured information Classification Rules. The DEL MARKED

command appears in place of the DEL ALL command when one or

more lines are marked for deletion.

Table 1 Priority Classification Configuration Screen Field Descriptions (Cont’d)

Use this field … To…

Table 2 provides a list of the classifications that can be selected in the Classification field and the

associated subclassifications.

Table 2 Classification List

Classification Subclassification

and Options Custom or Mask Value

Ethernet II Type> Ethernet II Type:

-IPX

- DOD IP

- ARP

- RARP

- AppleTalk

- Banyan Vines

- DECNET

- CUSTOM > Type Value: 0x00001

802.3 SAP>

New IP TOS:

- NO CHANGE

- TOS=PID

- CUSTOM>

Same

SSAP/DSAP (803.2):

- IP

TOS: Value = 0x00

- IPX

- IPX RAW

- BANYAN

- SNA

- CUSTOM > DSAP/SSAP Type: 0x0000

IP TOS

New IP TOS:

- NO CHANGE

- TOS=PID

- CUSTOM>

Type of Service:

0x0000

TOS: Value = 0x00

IP Protocol Type

New IP TOS:

- NO CHANGE

- TOS=PID

- CUSTOM>

IP Protocol Type:

TCP

TOS: Value = 0x00

- UDP

- ICMP

- IGMP

- OSPF

- CUSTOM > Protocol Type: 000

IPX COS IPX Class Of Service:

000

IPX Packet Type IPX Packet Type:

- Hello or SAP

- RIP

- Echo Packet

- Error Packet

- Netware 386/SAP

- Seq. Pkt Protocol

- Netware 286

- CUSTOM > IPX Packet Type: 00

Src IP Address

New IP TOS:

- NO CHANGE

- TOS=PID

- CUSTOM>

IP Address:

000.000.000.000

TOS: Value = 0x00

Mask:

000.000.000.000

Table 2 Classification List (Cont’d)

Classification Subclassification

and Options Custom or Mask Value

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