JQ - J ohn’s Q uarterly High Quality Gentlemen's Magazine

ATM Vs GigEATM Vs GigE The Breakfast ClubThe Breakfast Club

JQ - John’s Quarterly

High Quality Gentlemen's Magazine


The Great The Great ATM Vs GigEATM Vs GigE

DebateDebate

Cover Story: Cover Story:

Author: John A. ClarkAuthor: John A. Clark


Desktop ConnectivityDesktop Connectivity

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1995 1996 1997 1998 1999 2000

Ethernet Fast Ethernet Token Ring FDDI ATM

Industry analysis shows Ethernet is the clear choice for the desktopIndustry analysis shows Ethernet is the clear choice for the desktop Token Ring important in vertical marketsToken Ring important in vertical markets ATM to-the-desk for niche applicationsATM to-the-desk for niche applications


Backbone ComparisonsBackbone Comparisons Ease of Use/CostEase of Use/Cost Standards StatusStandards Status Compatibility IssuesCompatibility Issues Network Speed/distanceNetwork Speed/distance Supported ApplicationsSupported Applications Network ManagementNetwork Management Network ResilienceNetwork Resilience Routing/Layer 3 switchingRouting/Layer 3 switching


Ease of Use / CostEase of Use / Cost

Gigabit-EthernetGigabit-Ethernet Just “Plain Old Just “Plain Old

Ethernet” but many Ethernet” but many differencesdifferences

Not many New Skills Not many New Skills RequiredRequired

Low Risk / Low CostLow Risk / Low CostFeelingFeeling

ATMATM Now solid proven Now solid proven

technology - many technology - many reference installationsreference installations

Anchorage Accord Anchorage Accord simplifies ATM forum simplifies ATM forum standardsstandards

Some Administrative Some Administrative & Training Costs& Training Costs


Standards StatusStandards StatusGigabit-EthernetGigabit-Ethernet

802.3z802.3z Q1’98Q1’98 802.3ab802.3ab Q1’99Q1’99 802.3ax802.3ax NewNew

Flow ControlFlow Control 802.1P802.1P OKOK 802.1Q802.1Q Q1’98Q1’98 RSVP, RTP…RSVP, RTP… ????

ATMATM LANE 2.0LANE 2.0 OKOK MPOA 1.0MPOA 1.0 OKOK NHRPNHRP OKOK Sig 4.0Sig 4.0 OKOK TM 4.0TM 4.0 OKOK Anchorage Accord Anchorage Accord

combined standardcombined standard


Compatibility IssuesCompatibility IssuesGigabit-EthernetGigabit-Ethernet

Up to now only One-Up to now only One-on-One Testingon-One Testing

More Recently More Recently Gigabit-Ethernet Gigabit-Ethernet AllianceAlliance

ATMATM Many Independent Many Independent

Compatibility and Compatibility and Performance Tests Performance Tests are Availableare Available


Network Speed/DistanceNetwork Speed/Distance

Gigabit-EthernetGigabit-Ethernet 1000BaseCX: 25m1000BaseCX: 25m 1000BaseSX: 300m1000BaseSX: 300m 1000BaseLX: 550m 1000BaseLX: 550m

MM/3km SMMM/3km SM 1Gbps limit 1Gbps limit Network Diameter Network Diameter

Restrictions when Restrictions when SharedShared

ATMATM 25Mbps25Mbps 155Mbps - OC3c155Mbps - OC3c 622Mbps - OC12c622Mbps - OC12c

800m MM/15km SM800m MM/15km SM 2.4Gbps - OC48c … 2.4Gbps - OC48c …

no theoretical limitno theoretical limit No Network Diameter No Network Diameter

RestrictionsRestrictions


Supported ApplicationsSupported ApplicationsGigabit-EthernetGigabit-Ethernet

Pure LAN TechnologyPure LAN Technology Traffic Type: DataTraffic Type: Data QoS: Rudimentary: QoS: Rudimentary:

RSVPRSVP Flow Control: All-or-Flow Control: All-or-

Nothing, Localised Nothing, Localised (Impact on QoS ?)(Impact on QoS ?)

Enough Bandwidth to Enough Bandwidth to support everything …. support everything …. at the momentat the moment

ATMATM LAN / MAN / WANLAN / MAN / WAN Traffic Types: Data, Traffic Types: Data,

Voice, Video, …Voice, Video, … QoS: Sophisticated QoS: Sophisticated

CBR, UBR, ABR, …CBR, UBR, ABR, … Flow Control: Rate Flow Control: Rate

Based, End-to-EndBased, End-to-End New APIs will use New APIs will use

QoS and Optimise QoS and Optimise Traffic for Specific Traffic for Specific ApplicationsApplications


Network ManagementNetwork Management

Gigabit-EthernetGigabit-Ethernet Simple Adaptation of Simple Adaptation of

Ethernet MIBs and Ethernet MIBs and Actual ApplicationsActual Applications

ATMATM ATM Forum MIBs and ATM Forum MIBs and

Proprietary MIBs in Proprietary MIBs in current usecurrent use

WAN MIBs to be WAN MIBs to be finalisedfinalised

ATM complexity ATM complexity introduces some introduces some Network Management Network Management challengeschallenges


Network ResilienceNetwork ResilienceGigabit-EthernetGigabit-Ethernet

Spanning Tree Spanning Tree Protocol blocks Protocol blocks parallel links - stability parallel links - stability issues?issues?

No standards based No standards based load-sharing - Mostly load-sharing - Mostly proprietaryproprietary

Use of OSPF / RIP Use of OSPF / RIP with Layer 3 switchingwith Layer 3 switching

ATMATM Build-in RedundancyBuild-in Redundancy Parallel Load-sharing Parallel Load-sharing

links for resilience & links for resilience & aggregate bandwidthaggregate bandwidth

Full Meshed Full Meshed TopologiesTopologies


Routing/Layer 3 SwitchingRouting/Layer 3 Switching

Gigabit-EthernetGigabit-Ethernet Routing via high Routing via high

100/1000 Mbps links100/1000 Mbps links VLAN trunks with VLAN trunks with

IEEE 802.1Q comingIEEE 802.1Q coming Layer 3 hardware Layer 3 hardware

routing switches with routing switches with n Mbps throughout/ n n Mbps throughout/ n uusec latencysec latency

ATMATM Routing via high 100 Routing via high 100

Mbps links Mbps links (1000Mbps to follow)(1000Mbps to follow)

VLAN trunks with VLAN trunks with ATM VNR provenATM VNR proven

Layer 3 switching via Layer 3 switching via ATM Forum MPOA ATM Forum MPOA rolling out during 98rolling out during 98


What’s Your What’s Your Backbone Backbone Made Of?Made Of?

Backpage Questionnaire:Backpage Questionnaire:

10 questions to tell if you’re 10 questions to tell if you’re an “A” or a “G”an “A” or a “G”

JQ - J ohn’s Q uarterly High Quality Gentlemen's Magazine

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