Cisco ATM Overview

8/3/2019 Cisco ATM Overview

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1ATM Overview 2000, Cisco Systems, Inc.

ATM OverviewNetworking Academy

ATM Session


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Agenda

Introduction

ATM Fundamentals

The ATM Cell

ATM Connections

The ATM Address

ATM PVCs & SVCs Configuring RFC1483 PVCs &

SVCs


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Characteristics of ATM

Uses small, fixed-sized cells

Connection-oriented

Supports multiple service types

Applicable to LAN and WAN

Cells

Voice

Data

Video


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ATM Overview

ATM Switch - LS1010, LS2020, LS100. ATM Router - C4500/4700, C7200, C7000/7500 LAN Switch w/ATM up-link - Cat5000/5500, Cat2820,

Cat3x00 ATM DXI (HSSI to ATM) - ALL Cisco routers that support

HSSI interface.

CES (Circuit Emulation) - C7200 (CES-PA), LS1010

Private ATM Network

ATM Router

Public ATM Network

PBXPBX

HSSI

ADSU

Router

ATM Switch

LAN Switch


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ATM Basic

UNI = User-to-Network Interface

NNI = Network-to-Network Interface

Cell header content varies dependingon whos talking to whom

TokenRing

Public UNI

aka B-ICI

UNI

NNI

NNI

NNI

Public ATMNetwork

Private ATM Network


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Agenda

Introduction

ATM Fundamentals

The ATM Cell

ATM Connections

The ATM Address


SVCs


7/407ATM Overview 2000, Cisco Systems, Inc.

Creating Cells from Packets

Dest.Address

SourceAddress Data

FrameCheck

PayloadHeader

Packet

Cells

PayloadHeader

PayloadHeader

PayloadHeader

5 ByteHeader

48 BytePayload

ATM Cell

53Bytes



ATM Cell Header

5 ByteHeader

48 BytePayload

ATM Cell

53 Bytes



ATM Cell Header Details

GFC Generic Flow ControlUNI Cells Only!

VPI/VCI Identifies VirtualPaths and Channels

PTI Payload Type Identifier3 Bits:

1. User/Control Data2. Congestion3. Last Cell

CLP Cell Loss Priority Bit

HEC Header Error Check8 Bit CRC

ATM UNI Cell

48 BytePayload

GFC (4)VPI (8)

VCI (16)

PTI CLP

HEC

ATM NNI Cell

48 BytePayload

VPI (12)VCI (16)

PTI CLP

HEC



Agenda

Introduction

ATM Fundamentals

The ATM Cell

ATM Connections

The ATM Address


SVCs



Connection Types

Connectionless: Packet Routing

Path 1 = S1, S2, S6, S8

Path 2 = S1, S4, S7, S8

Data can take different pathand can arrive out of order

Connection Oriented: Cell Switching

VC = S1, S4, S7, S8

Data takes the same pathand arrives in sequence

S2 S6

S4 S7

S3 S5

S1 S8

1

1

1

2 2

2

S2 S6

S4 S7

VC

S1 S8S3 S5



ATM Basic

Connection oriented - Virtual circuit must tobe setup prior to any data transfer.

Each circuit is identified by 2 numbers -

Virtual Path Identifier (VPI) and VirtualChannel Identifier (VCI).

A Virtual Path is a bundle of Virtual

Channel. VPI and VCI has only local significant

across a particular link.



Virtual Path and Virtual Channels

ATM Physical LinkVirtual Channel Connection (VCC)

Virtual Path(VP)

Contains Multiple VCs

Virtual Channel Connection(VCC)

Contains Multiple VPs

Virtual Channel(VC)

Logical PathBetween ATM End Points

Virtual Channels (VC)

E3

OC12 Virtual Path (VP)

Virtual Path (VP)

Connection Identifier = VPI/VCI

Virtual Channels (VC)



ATM Switches

ATM switches translate VPI/VCI values

VPI/VCI value unique only per interfaceeg: locally significant and may be re-usedelsewhere in network

45

29

3

2

1

64292/9

4/5

6/4

2/9

1

2

1

3

4/5

2/9

2/9

6/4

2

1

3

1

VPI/VCIPort VPI/VCIPort

Input Output



A cell is switch at VC or VP level.VC Switching - Switch receive a cell with a configured VPI and VCI,it lookup its connection table to determine outgoing port (or ports) withnew VPI/VCI value.

VP Switching - Switch receive a cell with known VPI is send out to

new port with new VP value.

Port 1VPI 2VCI 100VCI 110

Port 2VPI 5VCI 110

Port 3 VPI 1 VCI 50

Port 4 VPI 7 VCI 100VCI 110

Port VPI/VCI Port VPI/VCI

1 2/100 4 7/1101 2/110 3 1/50

5 5/110 4 7/100

ORPort VPI Port VPI

1 2 4 7

2 5 3 1

VP and VC Switching



VP and VC Switching

VCI 1 VCI 2 VCI 3 VCI 4

VPI 2VPI 3VPI 1

VPI 2

VPI 3

VPI 5

VPI 1

VPI 4

Port 1

Port 2

Port 3

VCI 1

VCI 2

VCI 1

VCI 2

VP Switch

VC Switch

20

Vi t l Ch l



Virtual Channelsand Virtual Paths

This hop-by-hop forwarding is known as cellrelay

Virtual Channel Connection (VCC)

Virtual PathConnection (VPC)

VPSwitch

VCSwitch

VCSwitch

NNI NNI

VPI = 2

VCI = 44

VPI = 1

VCI = 1

VPI = 26

VCI = 44

VPI = 20

VCI = 30

UNIUNI



Agenda

Introduction

ATM Fundamentals

The ATM Cell

ATM Connections

The ATM Address


SVCs



ATM Address

DSP = Domain Specific Part

ESI = End System Identifier(MAC Address)

SEL = Selector

ICD ATM FormatIDP

IDI

20Bytes (40 Digits)

6 Bytes (12 Digits)13Bytes (26 Digits)

1 Byte

Prefix ESI

DSP ESI SEL

AFI = Authority and Format Identifier

ICD = International Code Designator

IDP = Initial Domain Part

IDI = Initial Domain Identifier

ICDAFI

Address Management


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ATM Address

47.0091.0000.0000.0000.0000.0000.1111.1111.1111.00

--------------ATM Prefix----------------MAC-----NA

Real life ATM address example:

Also referred to as an NSAP address

Address Management


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ATM Transport Standards

Here is My MAC Address (ESI)(00c0.acdc.3124.efa8)

What is My ATM Prefix?

Here is Your ATM Prefix

47.0090

Goal: No manual configurationof end stations

Address ManagementILMI Automatic Address Management


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Agenda

Introduction

ATM Fundamentals

The ATM Cell

ATM Connections

The ATM Address


SVCs


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ATM Connection

PVC

SVC

Soft PVC


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Setting up ATM VC

Three types of ATM connections:Permanent Virtual Connections (PVC):Manual configuration, typically static

configuration.Switched Virtual Connections (SVC):Circuit thats setup automatically throughsignaling protocol. Most higher layerprotocols operating over ATM use SVCs(LANE, MPOA, RFC1577 - CLIP.)

Soft PVC: Combination of SVC and PVC.


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Permanent Virtual Circuit (PVC)

Manual configuration.

Easy to understand and configure, but tedious.

All connection mapping are static, does not re-route around down link.

A

B

D

C

Input OutputPort VPI/VCI Port VPI/VCI

1 33 3 02

2 15 3 14

1 64 3 29

3 29 1 64


1 29 3 45

2 52 4 15

1 64 3 29

3 29 1 64


1 45 2 16

2 52 1 29

1 64 3 29

3 29 1 64

29

30

10

16

15

45 14

43


1 16 2 43

3 14 4 10

1 64 3 29

3 29 1 64

1

2

4 2

3

3

2

4

12

3


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Switched Virtual Circuit (SVC)

Dynamically set up connectionsvia signaling

B

D

1

2

4 1

3

3

2

4

12

UNI

Signaling NNISignaling

CUNISignaling


1 64 3 29

3 29 1 64


2 52 1 29

1 64 3 29

3 29 1 64


1 29 3 45

1 64 3 29

3 29 1 64


1 64 3 29

3 29 1 64A

3


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Transfer data over newly established link

B

D

1

2

4 1

3

3

2

4

12

UNI

Signaling NNISignaling

CUNISignaling


1 64 3 29

3 29 1 64


2 52 1 29

1 64 3 29

3 29 1 64


1 29 3 45

1 64 3 29

3 29 1 64


1 64 3 29

3 29 1 64A

3

1 29 3 45

1 45 2 16 1 16 2 43


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Dynamically tear down

connectionsvia signaling

B

D

1

2

4 1

3

3

2

4

12

NNISignaling

CUNISignaling


1 64 3 29

3 29 1 64


2 52 1 29

1 64 3 29

3 29 1 64


1 29 3 45

1 64 3 29

3 29 1 64


1 64 3 29

3 29 1 64A

3

UNI

Signaling


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Soft PVC

PVC established manually across UNI

and dynamically across NNI

B

D

1

1

2

NNISignaling

UNISignaling


1 64 3 29

3 29 1 64


2 52 1 29

1 64 3 29

3 29 1 64


1 29 3 45

1 64 3 29

3 29 1 64


1 64 3 29

3 29 1 64

3

UNI

Signaling

1 29 3 45

1 16 2 43

C

A


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Setting up SVC

Station A wants to connect to Station B:Station A send a call setup to the Station Bs ATM address via signaling

channel (VPI/VCI = 0/5)Call-setup signaling is routed through ATM switches to Station B.Station B accepts the Call-setup request, send ACK back to Station A.

Connection is established

Once ACK is received by Station A, a end-to-end circuit is establishedthrough ATM network. VPI/VCI number is dynamically assignedbetween each hop.

Requirements:

1. Addressing

2. Signaling3. Path Determination (routing)


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Agenda

Introduction

ATM Fundamentals

The ATM Cell

ATM Connections

The ATM Address


SVCs

C fi ti


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Configuration(1483 Routed)

Configuration of San Jose Router

interface ATM0

ip address 172.10.10.1 255.255.255.0

atm pvc 1 0 40 aal5snap

atm pvc 2 0 50 aal5snap 1500 512 64

map-group 1483pvc

map-list 1483pvc

ip 172.10.10.2 atm-vc 1 broadcast



Denver Iowa

A0 A1/1/1 A1/1/2 A3/0/0 A3/0/1 A0

ATM Cloud

A2/0

A3/0/2

Destination VCD VPI VCI

New York 1 0 50

Chicago 2 0 40

ChicagoATM SideAddressIP: 172.10.10.2

LightStream1010

Cisco 7000

Cisco 4700

New YorkATM Side AddressIP: 172.10.10.3

Cisco 4700

San JoseATM Side AddressIP: 172.10.10.1

Light Stream1010

C fi ti


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Configuration of Denver LightStream 1010 Switchinterface ATM1/1/1

description Link to San Jose Routerinterface ATM1/1/2

description Link to Iowa switchno keepaliveatm pvc 1 40 interface ATM1/1/1 0 40atm pvc 1 50 interface ATM1/1/1 0 50

Configuration of Iowa Light Stream 1010 Switch

interface ATM3/0/0description Link to Denver switchno keepalive

interface ATM3/0/1description Link to New York Routerno keepalive

atm pvc 0 50 interface ATM3/0/0 1 50

interface ATM3/0/2description Link to Chicago Routerno keepaliveatm pvc 0 40 interface ATM3/0/0 1 40atm pvc 0 60 interface ATM3/0/1 0 60

San JoseATM Side Address

IP: 172.10.10.1

Light Stream1010

Denver Iowa

New YorkATM Side Address

IP: 172.10.10.3

Light Stream1010

A0 A1/1/1 A1/1/2 A3/0/0 A3/0/1 A0

ATM Cloud

A2/0

A3/0/2

ChicagoATM SideAddressIP: 172.10.10.2

Cisco 7000

Cisco 4700 Cisco 4700

C fi ti


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Configuration of New YorkRouter

interface ATM0

ip address 172.10.10.3 255.255.255.0

atm pvc 1 0 50 aal5snap 1500 512 64


map-group 1483pvcmap-list 1483pvc





IP: 172.10.10.1

Light Stream1010

Denver Iowa


IP: 172.10.10.3

Light Stream1010

A0 A1/1/1 A1/1/2 A3/0/0 A3/0/1 A0

ATM Cloud

A2/0

A3/0/2


San Jose 1 0 50

Chicago 2 0 60

Cisco 4700Cisco 4700

ChicagoATM Side AddressIP: 172.10.10.2

Cisco 7000


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Topology

Cisco 1483 with PVC (Bridged)ChicagoATM Side Address

IP: 172.10.11.2


IP: 172.10.10.1

172.10.11.1

LightStream1010

Denver Iowa


Management IP

172.10.10.3

LightStream1010


A0 A1/1/1 A1/1/2 A3/0/0 A3/0/1 A0

ATM Cloud

A2/0

A3/0/2

Cisco 4700

C fi ti


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Configuration(1483 Bridged)

Configuration of San JoseRouterinterface ATM0.1 point-to-multipoint

description Circuit to New York


map-group 1483pvc

bridge-group 1

interface ATM0.2 point-to-point

description Circuit to Chicago

ip address 172.10.11.1 255.255.255.0


interface BVI1ip address 172.10.10.1 255.255.255.0

map-list 1483pvc

bridge atm-vc 1 broadcastbridge irbbridge 1 protocol ieee

bridge 1 route ip

LightStream1010

Denver Iowa

LightStream1010

A0 A1/1/1 A1/1/2 A3/0/0 A3/0/1 A0

ATM Cloud

A2/0

A3/0/2


New York 1 0 50

Chicago 2 0 40

ChicagoATM Side AddressIP: 172.10.11.2

Cisco 4700

Cisco 7500

San JoseATM Side AddressIP: 172.10.10.1172.10.11.1

New YorkATM Side AddressManagement IP:172.10.10.3

Catalyst 5000

Config ration


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Configuration of Denver LightStream 1010 Switchinterface ATM1/1/1

description Link to San Jose Routerinterface ATM1/1/2

description Link to Iowa switchno keepaliveatm pvc 1 40 interface ATM1/1/1 0 40atm pvc 1 50 interface ATM1/1/1 0 50

Configuration of Iowa LightStream 1010 Switch

interface ATM3/0/0description Link to Denver switchno keepalive

interface ATM3/0/1description Link to New York Router

no keepaliveatm pvc 0 50 interface ATM3/0/0 1 50

interface ATM3/0/2description Link to Chicago Routerno keepaliveatm pvc 0 40 interface ATM3/0/0 1 40atm pvc 0 60 interface ATM3/0/1 0 60

San Jose

ATM Side AddressIP: 172.10.10.1

LightStream

1010

Denver Iowa

New York

ATM Side AddressIP: 172.10.10.3

LightStream

1010


A0 A1/1/1 A1/1/2 A3/0/0 A3/0/1 A0

ATM Cloud

A2/0

A3/0/2

ChicagoATM Side Address

IP: 172.10.10.2

Cisco 7000

No configuration change on LS1010

Configuration


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Configuration of New York Switch(LANE module):

interface ATM0


atm bind pvc vlan 10 1!


IP: 172.10.10.1172.10.11.1

New YorkATM Side AddressManagement IP:

172.10.10.3

Catalyst 5000

LightStream1010

Denver Iowa

LightStream1010

Cisco 7500

A0 A1/1/1 A1/1/2 A3/0/0 A3/0/1 A0

ATM Cloud

A2/0

A3/0/2

ChicagoATM Side Address

IP: 172.10.11.2Cisco 4700

This command maps a vlan into a atm cirucuit

Atm bind pvc vlan

C fi i


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Configuration(Back to Back)


IP: 172.10.10.1


IP: 172.10.10.3


A0 A0

Configuration of San Jose Router

interface ATM0

atm clock internal

ip address 172.10.10.1 255.255.255.0


map-group 1483pvcmap-list 1483pvc


Configuration of New York Router

interface ATM0

ip address 172.10.10.3 255.255.255.0


map-group 1483pvc

map-list 1483pvcip 172.10.10.1 atm-vc 1 broadcast


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Documents

Cisco ATM Overview