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1SP Latin America © 2001, Cisco Systems, Inc. All rights reserved.
Metro Ethernet Metro Ethernet L2 & L3 L2 & L3 ArchitecturesArchitectures
Paul [email protected]
AgendaAgendaAgendaAgenda
Market Market DynamicsDynamics
Market Market DynamicsDynamics
StandardsStandardsStandardsStandards
Metro Ethernet ServicesMetro Ethernet ServicesMetro Ethernet ServicesMetro Ethernet Services
Metro Ethernet Control Metro Ethernet Control PlanesPlanes
Metro Ethernet Control Metro Ethernet Control PlanesPlanes
Summary Summary Summary Summary
Infrastructure & Technology Infrastructure & Technology OptionsOptions
Infrastructure & Technology Infrastructure & Technology OptionsOptions
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 333
AccessAccess Metro NetworkConnects Customers
to Services
Metro NetworkConnects Customers
to Services
AccessAccess Metro NetworkConnects Customers
to Services
Metro NetworkConnects Customers
to Services
AccessAccess
Service POPService POP
Co
re R
ou
tin
gC
ore
Ro
uti
ng
Ed
ge
Ro
uti
ng
Ed
ge
Ro
uti
ng
Gro
om
ing
Gro
om
ing
Service Adaptationand Packet Switching
Service Adaptationand Packet Switching
Core TransportInterconnects PoPs
Core TransportInterconnects PoPs
Metro NetworkConnects Customers
to Services
Metro NetworkConnects Customers
to Services
AccessAccess
Service POPService POP
Co
re R
ou
tin
gC
ore
Ro
uti
ng
Ed
ge
Ro
uti
ng
Ed
ge
Ro
uti
ng
Gro
om
ing
Gro
om
ing
Service Adaptationand Packet Switching
Service Adaptationand Packet Switching
Control Planes and Network Management Integration
The Service Provider Transport Network Architecture
• SDH• Mesh• DWDM• IP/MPLS POS
• VPNs• QoS• App Hosting• Content Hosting
• Web Hosting• Voice over Packet• Packet Transport
Packet Services:Packet Services:• DSL• Fixed Wireless• Frame Relay• ATM• Leased Lines• Cable• Ethernet
• SDH• DWDM• IP/RPR• Gig Ethernet
The Services Bandwidth BarrierThe Services Bandwidth Barrier
Cu
sto
me
r N
etw
ork
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 444
Issues Facing Subscribers and Network Operators in the First Mile
• Basic net structure is TDM and 64k bandwidth increments
• Need flexible bandwidth, just-in-time provisioning
• Multiple types of NEs
• Need to support new services, generate revenue
Network OperatorsNetwork Operators
Subscribers: Business and ResidentialSubscribers: Business and Residential
• Access is still slow
• Too much hand-holding, provisioning takes days
• Few bandwidth options: kilobit, E1, or E3, nothing in between
• If there is no service, subscribers don’t need higher bandwidth
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 555
Economic and Standard Driver
10
100
1.000
10.000
100.000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
$/P
ort
/Mb
ps/
Mo
nth
SDH
ATM
GE
Souce: BCR Sept, 2000 by Peter Sevcik, NetForecast, Waltham, MA
Cost of delivering bandwidthCost of delivering bandwidth
• LAN applicationsLAN applications
• MAN applicationsMAN applications
• WAN applicationsWAN applications
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 666
End Customer Benefits from 1M to 100M
0
20
40
60
80
100
120
140
160
0 20 40 60 80 100
Customer Need (Mbps)
Se
rvic
e (
Mb
ps
)
• Flexibility & ChoiceWide choice of bandwidths
Pay for what you need
Keep your equipment and change bandwidth
EthernetEthernet
Legacy TDMLegacy TDM
Two Network Infrastructure Changes;Two Customer Equip Interface Changes
One Network Infrastructure ChangeOne Customer Equip Interface Change
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 777
US Metro Ethernet Services Opportunity
0
500
1000
1500
2000
2500
3000
2000 2001 2002 2003 2004 2005
$ M
illi
on
s
Aggressive
Conservative
Source: IDC, Gartner Group, Yankee Group, Cisco Analysis
AgendaAgendaAgendaAgenda
Market DynamicsMarket DynamicsMarket DynamicsMarket Dynamics Infrastructure & Technology Infrastructure & Technology
OptionsOptions Infrastructure & Technology Infrastructure & Technology
OptionsOptionsStandardsStandardsStandardsStandards
Metro Ethernet ServicesMetro Ethernet ServicesMetro Ethernet ServicesMetro Ethernet Services
Metro Ethernet Control Metro Ethernet Control PlanesPlanes
Metro Ethernet Control Metro Ethernet Control PlanesPlanes
Summary Summary Summary Summary
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 999
BusinessRing
MetropolitanRing
Backbone Ring
STM-16STM-16
STM-4STM-4STM-1STM-1
TransitSwitch
LocalSwitch
LocalSwitch
Traditional Metro Infrastructure
Digital Cross ConnectDigital Cross Connect
Pre-Internet
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 101010
Traditional Metro Infrastructure
Internet Era
STM-16STM-16
STM-4STM-4STM-1STM-1
Backbone Ring
BusinessRing
MetropolitanRing
Digital Cross ConnectDigital Cross Connect
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 111111
• Rigid Bandwidth Hierarchy
• No Statistical Multiplexing
• No Burst Support
• No L2 and L3 Integration
• No Multicast Support
• No QoS
Traditional Metro Infrastructure Issues
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 121212
BusinessRing
MetropolitanRing
Backbone RingNextGen SDH
Backbone Network
Next Generation SDH Infrastructure Option
Digital Cross ConnectDigital Cross Connect
STM-16STM-16
STM-4STM-4STM-1STM-1
STM-1/4/16/64 Business Ring
STM-1/4/16/64Metropolitan
Ring
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 131313
Data
Regional Metro EthRegional Metro Eth
Met
ro E
th
Acc
ess
Met
ro E
th
Acc
ess
Metro Eth
Access
Metro Eth
Access
New Metro Ethernet Networks
Metro Ethernet Infrastructure Option
AccessRing
AccessRing
3/1 Digital Cross Connect
3/1 Digital Cross Connect
Regional Ring
OC-48OC-48
OC-12OC-12OC-12OC-12
OC-3OC-3OC-
3OC-
3
OC-12OC-12OC-3OC-3
OC-48OC-48OC-48OC-48 OC-48OC-48
AccessRing
AccessRing
3/1 Digital Cross Connect
3/1 Digital Cross Connect
Regional Ring
OC-48OC-48
OC-12OC-12OC-12OC-12
OC-3OC-3OC-
3OC-
3
OC-12OC-12OC-3OC-3
OC-48OC-48OC-48OC-48 OC-48OC-48
Voice/TDM
Existing Networksfor Voice Growth
VoIP Gateway Video/IP Server
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 141414
Two Technology Options
• Option 1: Ethernet Transport/Backhaul
• Option 2: RPR Transport/Backhaul
• Both provide Ethernet customer facing interfaces (UNI)
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 151515
ONTONT
CO OSP CPE
100 Mbps< 100 m
GatewayGatewayGatewayGateway
1 Gbps < 10 km
100 Mbps< 2 km
ONTONT
ONTONT
TVTVTVTV PCPC
PCPC
PC
1000BASE-LX100BASE-FX
10
00
BA
SE
-X1000BASE-LX100BASE-FX
Data
Data
Video
Video
VoIPVoIP
VidVid
Residential
Business
ONT= Optical network terminator
OSP= Outside plant
Cat 5
SM or MM fiber
SM or MM fiber
Metro Access with EFM/ETTX Alternative Ethernet Transport/BackhaulEthernet Transport/Backhaul
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 161616
Subtended Ring
POP/HUB
SiSi
SiSi SiSi SiSi SiSi
Access Aggregation
Layer
Customer AccessLayer
SiSi
SiSi
GE Hub&Spoke GE Rings
Metro Access with EFM/ETTX Alternative Ethernet Transport/BackhaulEthernet Transport/Backhaul
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 171717
The RPR (Resilient Packet Ring) Alternative Powered by Dynamic Packet TransportPowered by Dynamic Packet Transport
• Dynamic Packet Transport (DPT), the market-
leading Resilient Packet Ring (RPR) IEEE
802.17 solution
• Based on the Cisco-developed Spatial Reuse Protocol (SRP) – RFC 2892
Regional Metro IPRegional Metro IPRegional Metro IPRegional Metro IP
Metro IP
Acc
ess
Metro IP
Acc
ess
Metro IP
Acc
ess
Metro IP
Acc
ess Metro IP Access
Metro IP Access
Metro IP Access
Metro IP Access
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 181818
The RPR (Resilient Packet Ring) Alternative Reliable IP/MPLS-aware Optical TransportReliable IP/MPLS-aware Optical Transport
• Flexible architectures: Optical rings and stars, SRP/node re-ordering
• Carrier-class reliability: <50ms recovery; IPS/L2 Path Restoration
• Multi-layer Awareness: L1(optical monitoring); L2 (SRP stats); L3 (IP Statistics)
• Plug-and-Play operation: DPT features (topology discovery/ adds); Ethernet subscriber interfaces
• STM4, STM16 speeds, doubled, 1Gbps, 5Gbps
Regional Metro IPRegional Metro IPRegional Metro IPRegional Metro IP
Metro IP
Acc
ess
Metro IP
Acc
ess
Metro IP
Acc
ess
Metro IP
Acc
ess Metro IP Access
Metro IP Access
Metro IP Access
Metro IP Access
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 191919
MACMAC
MACMAC
L3L3
MACMAC
MACMAC
L3L3
MACMAC
MACMAC
L3L3
MACMAC
MACMAC
L3L3
O-Tx
I-Rx
O-Rx
I-Tx
O-Rx
I-Tx
O-Tx
I-Rx
O-T
x
I-R
x
O-R
x
I-T
x
I-T
x
O-R
x
I-R
x
O-T
xSRP-LC SRP-LC
SRP-LCSRP-LC
Ring B
Ring A
The RPR Ring Packet Flow
Ring A
Ring A
Ring A
Ring B
Ring B
Ring B
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 202020
L3 SwitchingL3 Switching
Rx Queue Tx Queue
Lo
Pri
ori
tyL
o P
rio
rity
Hi
Pri
ori
tyH
i P
rio
rity
Hi P
riority
Hi P
riority
Lo
Prio
rityL
o P
riority
O-RxO-Rx
I-TxI-Tx
O-TxO-Tx
I-RxI-Rx
Transit Buffer
Transit BufferSRP MAC SRP MAC
Hi PriorityHi Priority
Lo PriorityLo Priority
The RPR Node Packet Flow
Hi PriorityHi Priority
Lo PriorityLo Priority
Ring A
Ring B
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 212121
• Packet flowSourced onto ring with multicast bit set
Received by appropriate routers on ring
Stripped from ring by source
The RPR Multicasting SupportThe RPR Multicasting Support
Source
GSRGSR
Cisco 75XXCisco 75XX
Cisco 75XXCisco 75XX
GSRGSR
Cisco 75XXCisco 75XX
Cisco 75XXCisco 75XX
Cisco 75XXCisco 75XX
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 222222
Metro IP/Ethernet Architecture Optimize the Metro Optical InfrastructureOptimize the Metro Optical Infrastructure
IPIP
ATMATM
OpticalOptical
B-ISDNB-ISDN IP over ATM
IP over ATM
IP over SONET/SDH
IP over SONET/SDH
IPIP
IP-aware Optical
IP-aware Optical
IP over OpticalIP over Optical
IPIP
SONET/SDHSONET/SDH
OpticalOptical
ATMATM
SONET/SDHSONET/SDH
IPIP
OpticalOptical
Multiplexing, Protection, and Management at Every Layer
Lower Cost, Complexity, and OverheadLower Cost, Complexity, and Overhead
AgendaAgendaAgendaAgenda
Market DynamicsMarket DynamicsMarket DynamicsMarket Dynamics
StandardsStandardsStandardsStandards
Metro Ethernet ServicesMetro Ethernet ServicesMetro Ethernet ServicesMetro Ethernet Services
Metro Ethernet Control Metro Ethernet Control PlanesPlanes
Metro Ethernet Control Metro Ethernet Control PlanesPlanes
Summary Summary Summary Summary
Infrastructure & Technology Infrastructure & Technology OptionsOptions
Infrastructure & Technology Infrastructure & Technology OptionsOptions
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 242424
Resilient Packet Ring (RPR) Standards January 2002 IEEE 802.17 Proceedings—The Darwin ProposalJanuary 2002 IEEE 802.17 Proceedings—The Darwin Proposal
• A new proposal-Darwin, was presented and is based on Cisco developed SRP technology (IETF informational RFC 2892). It retains the features and benefits of SRP with the addition of enhancements for broader industry application. It continues work that was published as the Gandalf proposal.
• Darwin was proposed as the basis for the first working group draft.
• The Darwin proposal has support from over 20 companies
http://www.ieee802.org/17/documents.htm
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 252525
Resilient Packet Ring (RPR) Standards IEEE 802.17 Working Group TimelineIEEE 802.17 Working Group Timeline
• As found in http://www.rpralliance.org/articles/Timeline.pdf
Nov 2001 – Proposal Draft
Jan 2002 – First draft
Mar 2002 – Last Addition to draft
Jul 2002 – Working Group Ballot
Sep 2002 – Last technical change
Nov 2002 – IEEE 802 Sponsor ballot
Mar 2003 - Standard
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 262626
IEEE 802.3ah EFM Standards Layer DiagramLayer Diagram
Ethernet Media Independent Interface (MII)optional
Media Access Control (MAC)Full Duplex
Media Access Control (MAC)Full Duplex
EoVDSL PHYEoVDSL PHY
Copper Copper PMDPMD
Copper Copper PMDPMD
OpticalOpticalPMDPMD
OpticalOpticalPMDPMD
EPON PHYEPON PHY
Optical Optical PMDPMD
Optical Optical PMDPMD
1000BASE-X PHY 1000BASE-X PHY
http://grouper.ieee.org/groups/802/3/efm/public/index.html
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 272727
• EFM SG (Ethernet in the First Mile Speed Study Group)• PAR (Project Authorization Request)• 802.3ah—the name of the projectand the name of the sub-committee of IEEE 802.3 chartered with writing the Ethernet in the first mile standard
IEEE 802.3ah EFM Standards Prospective Schedule for IEEE 802.3ah Task ForceProspective Schedule for IEEE 802.3ah Task Force
WorkingGroupBallot
LMSCBallot
Standard
2000 2002 20032001
802.3ahFormed802.3ahFormed
PARDrafted
PARDrafted
PARApproved
PARApproved
EFM SGFormedEFM SGFormed
AgendaAgendaAgendaAgenda
Market DynamicsMarket DynamicsMarket DynamicsMarket Dynamics
StandardsStandardsStandardsStandards
Metro Ethernet Metro Ethernet ServicesServices
Metro Ethernet Metro Ethernet ServicesServices
Metro Ethernet Control Metro Ethernet Control PlanesPlanes
Metro Ethernet Control Metro Ethernet Control PlanesPlanes
Summary Summary Summary Summary
Infrastructure & Technology Infrastructure & Technology OptionsOptions
Infrastructure & Technology Infrastructure & Technology OptionsOptions
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 292929
Control Plane And Data Plane
• Network functions separated into 2 planes
• Control PlaneRouting protocols, creates FIBs
Builds adjancey tables
What the Processor does
• Data PlaneForwards packets
High Speed ASICSs
FIB tables installed
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 303030
Metro Ethernet Planes
InternetAccessInternetAccess
Diff (CoS)Services
Diff (CoS)Services
TLS(L2 VPN)
TLS(L2 VPN)
IP VPN(L3 VPN)IP VPN
(L3 VPN)Packet
TelephonyPacket
Telephony
IEEE 802.1Q IEEE 802.1Q
Spanning Tree ProtocolSpanning Tree Protocol
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 313131
Flat Metro Ethernet Switching System
MetroNetwork
EnterpriseCampus
B 10/100MbitEthernet
GbE GbE
EnterpriseCampus
C
4000* 4000*
3550
3550 3550
3550UNI UNI
802.1QinQ/STP Control Plane802.1QinQ/STP Control PlaneTransparent LAN SvcTransparent LAN Svc
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 323232
Metro Ethernet Planes => Scalability
InternetAccessInternetAccess
Diff (CoS)Services
Diff (CoS)Services
TLS(L2 VPN)
TLS(L2 VPN)
IP VPN(L3 VPN)IP VPN
(L3 VPN)Packet
TelephonyPacket
Telephony
Spanning Tree Protocol & IP/MPLSSpanning Tree Protocol & IP/MPLS
IEEE 802.1q / UTI/EoMPLS / MPLS VPNIEEE 802.1q / UTI/EoMPLS / MPLS VPN
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 333333
Scalable Metro Ethernet Switching System
802.1q Tag802.1q Tag 802.1q Tag802.1q Tag
EoMPLS Control PlaneEoMPLS Control PlaneEthernet VC SvcEthernet VC Svc
MPLS Control PlaneMPLS Control PlaneIP VPN ServiceIP VPN Service
EnterpriseCampus
MPLS-enabledNetwork
Metro Network
Metro Network
EnterpriseCampus
7600 7600
3550/4000
3550/4000
3550/4000
3550/4000
UNI
UNI
GE
GE
GE
GE
GE
802.1qinq Tag802.1qinq Tag 802.1qinq Tag802.1qinq Tag
EoMPLS Control Plane EoMPLS Control Plane Directed VLAN SvcDirected VLAN Svc
12000
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 343434
Metro IP/Ethernet (RPR) Planes
InternetAccessInternetAccess
Diff (CoS)Services
Diff (CoS)Services
TLS(L2 VPN)
TLS(L2 VPN)
IP VPN(L3 VPN)IP VPN
(L3 VPN)Packet
TelephonyPacket
Telephony
IP / UTI/L2TPv3 / EoMPLS / MPLS VPNIP / UTI/L2TPv3 / EoMPLS / MPLS VPN
IEEE 802.17 RPRIEEE 802.17 RPR
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 353535
Metro IP (RPR) System Ethernet Access
10720/7600
DPT/RPR
12000
UNI
IP Control PlaneIP Control PlaneIP ServiceIP Service
MPLS Control PlaneMPLS Control PlaneIP VPN SvcIP VPN Svc
EoMPLS or L2TPv3 CPEoMPLS or L2TPv3 CPEthernet VC SvcEthernet VC Svc
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 363636
Hybrid Metro IP/Metro Ethernet Switching
10720/760012000Enterprise
Campus
3550/4000
3550/4000
UNI
DPT/RPR
802.1q Tag802.1q Tag
IP Control PlaneIP Control PlaneIP ServiceIP Service
MPLS Control PlaneMPLS Control PlaneIP VPN SvcIP VPN Svc
EoMPLS or L2TPv3 CPEoMPLS or L2TPv3 CPEthernet VC SvcEthernet VC Svc
GE
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 373737
Discussion (1)
• TLS is required when customers have a need to interconnect individual L2 networks to form a single flat L2 network where connectivity is controlled by the Spanning Tree Protocol
• TLS assumes L2 capabilities in SP network which can lead to scalability problems there
participation of SP switches in STP (performance, stability)
increase of number of hops (customer has to add number of hops in SP network to those in his own network to check whether requirements of max. 7 for STP are still met)
knowledge of customers‘ MAC addresses by SP switches (number potentially huge!)
• SPs should thoroughly understand their customers‘ real needs, i.e., find out whether they really need TLS, or whether EVCS would be better suited (sometimes TLS is falsely used as a synonym for all the Ethernet-based approaches presented)
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 383838
Ethernet Transparent LAN Service – 802.1QinQ
802.1Q Trunks to Customer Defined VLANS
SiSi
SiSi
SiSi SiSi
L2 EthernetEnterpriseSite C
EnterpriseSite D
EnterpriseSite A
EnterpriseSite B
To the Enterprise this network look like a shared flat earth 802.1Q Ethernet Domain
A B C D
Access (L2)802.1QinQ
Access (L2)802.1QinQ
Access (L2)802.1QinQ
Access (L2)802.1QinQ
Core (L2)802.1Q
Core (L2)802.1Q
802.1Q
802.1QinQ
802.1QinQ
802.1QinQ
802.1QinQ
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 393939
Discussion (2)
• Enterprise networks are typically built using routers between (small) L2 segments (e.g. spanning a floor of a building)
• Interconnection of enterprise sites virtually always uses gateway routers into the SP network=> EVCS is most appropriate L2 service to interconnect enterprise sites
• EVCS can be provided using EoMPLS or L2TPv3 mechanisms across a L3 network, thus avoiding scalability problems inherent to L2 networks in SP environment
• Ethernet Service is not necessarily LAN Emulation
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 404040
Ethernet Virtual Circuit – EoMPLS
EnterpriseCampus
A Ethernet Mapped Circuit
Access (L2)Ethernet
Access (L2)Ethernet
Access (L2)Ethernet
Access (L2)Ethernet
CoreMPLSCoreMPLS
Ethernet CircuitEoMPLS Tunnel in Core Enterprise
CampusB
MPLS
10/100/GigabitEthernet
10/100/GigabitEthernet
To the Enterprise this network is a pair of Pt to Pt 10/100/Gbit/s Bridged Ethernet Links
A B
MPLS PE MPLS PE
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 414141
Ethernet Virtual Circuit – L2TPv3 (UTI)
EnterpriseCampus
A Ethernet Mapped Circuit
Access (L2)Ethernet
Access (L2)Ethernet
Access (L2)Ethernet
Access (L2)Ethernet
CoreIP
CoreIP
Ethernet CircuitIP Tunnel in Core Enterprise
CampusB
IP
10/100/GigabitEthernet
10/100/GigabitEthernet
To the Enterprise this network is a pair of Pt to Pt 10/100/Gbit/s Bridged Ethernet Links
A B
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 424242
Layer-2 Transport across MPLS
• Two relevant drafts by Luca Martinidraft-martini-l2circuit-trans-mpls
describes label distribution mechanisms for VC labels
draft-martini-l2circuit-encap-mpls
describes emulated VC encapsulation mechanisms
• Relevant for the transport of FR, ATM AAL5, ATM cell, Ethernet (Port Trunking), Ethernet 802.1q (VLAN), POS, TDM, Cisco HDLC & PPP protocol data units
across either an MPLS or an IP backbone
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 434343
CC VC info lengthVC info length
Group IDGroup ID
VC IDVC ID
Interface ParametersInterface Parameters
Virtual Circuit FEC Element
C: Control Word (1 bit) – Control word present if bit set
VC-type (15 bits) - Type of VC e.g FR, ATM, VLAN, Ethernet, PPP, HDLC
VC info length (8 bits) – Length of VCID field and interface parameters
Group ID (32 bits) – Represents a groups of VCs. Can be used for mass label withdrawal
VC ID (32 bits) – Connection identifier used in conjunction with the VC-type to identify a particular VC
Interface Parameters (Variable) – Edge facing interface parameters, such as MTU
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
VC-typeVC-typeVC TLV (0x80)VC TLV (0x80)
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 444444
LengthLength Sequence numberSequence numberRsvdRsvd FlagsFlags
EXPEXP TTL (set to 2)TTL (set to 2)11VC Label (VC)VC Label (VC)
EXPEXP TTLTTL00Tunnel Label (LDP or RSVP)Tunnel Label (LDP or RSVP)
Layer-2 PDULayer-2 PDU
• When transporting layer-2 protocols over an IP or MPLS backbone:
The sequence of the packets may need to be preserved;
Small packets may need to be padded if the minimum MTU of the medium is larger than actual packet size;
Control bits carried in header of Layer-2 frame may need to be transported
Layer-2 Transport Control Word
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
00 00
VC LabelVC Label
Tunnel LabelTunnel Label
Control WordControl Word
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 454545
Transport of Ethernet over MPLS
• Three main requirements for transport of Ethernet frames
802.1q VLAN to 802.1q VLAN transport;
802.1q VLAN port to port transport;
Ethernet port to port transport
• 802.1q VLAN to VLAN transport VC-type 0x0004 within draft-martini-l2circuit-trans-mpls;
VC-type 0x0005 port-to-port Ethernet trunking & port-to-port
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 464646
Ethernet 802.1q VLAN Transport
MPLS
VLAN 41
VLAN 41
VLAN 56
VLAN 56
PE1 1.0.0.4
PE1 1.0.0.8
802.1q to 802.1q VLAN Transport
Customer Site
Customer Site
Customer Site
Customer Site
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 474747
EoMPLS Encapsulation Details
• Ethernet PDUs are transported without the preamble, SFD and FCS
but including all VLAN information such as VCID
• The control word is optional
C bit is set by default in Cisco implementation
• If the control word is used then the flags must be set to zero
The VLAN tag is transmitted unchanged but may be overwritten by the egress PE router
LengthLength Sequence numberSequence numberRsvdRsvd 0 0 0 00 0 0 0
Ethernet PDUEthernet PDU
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
00 00 OptionalOptional
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 484848
IP VPN, L2TP, UTI
• Cisco Product: “UTI/L2TPv3”
• UTI is a high performance transparent tunnelling protocol. It is aimed at 150Mb/s to 10Gb/s level two tunnelling applications
Encapsulation: L2TPv3
IETF standardization: L2TPv3: data & control planes http://www.ietf.org/html.charters/l2tpext-charter.html
Cisco Pre-Standard’s technology: UTI
11/01: UTI matches L2TPv3 latest draft
UTI: Universal Transport Interface
high-performance transparent encapsulation protocol optimized for the encapsulation of one protocol over another.
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 494949
UTI/L2TPv3 Encapsulation
• One of the formats that L2TPv3 will support is the existing UTI encapsulation draft-ietf-l2tpext-l2tp-base-01.txt
IP header
UTIPayload Independent
Header
UTIPayload Dependent
Header
Payload
UTI Header
0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| TUNNEL IDENTIFIER | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| TUNNEL Key |+ +| (64 bit signature) | -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 505050
Basic UTI/L2TPv3 tunnels
• Crossconnect any interface with any other interface through an IP network
IP Network
UTI tunnelled LAN
UTI tunnelled serial interface
R1R2
LAN1LAN2
tu1
tu2
e1 e2
pos2 pos3R3 R4
pos1 pos4
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 515151
Why UTI/L2TP rather than GRE?
• UTI/L2TPv3 is more scalable to high performance (10G)
To identify a GRE tunnel you have to do a source + destination IP address pair lookup. This is very perf consuming and not needed for L2Transport
GRE header has many options which are complex to program in HW
Scales to 10gbps
• Leverage L2TP control plane and deployment experience
IETF since 96, IOS implementation since 98
Similar Objective (Eth, FR, PPP over IP)
Experience to be leveraged
AgendaAgendaAgendaAgenda
Market DynamicsMarket DynamicsMarket DynamicsMarket Dynamics
StandardsStandardsStandardsStandards
Metro Ethernet Metro Ethernet ServicesServices
Metro Ethernet Metro Ethernet ServicesServices
Metro Ethernet Control Metro Ethernet Control PlanesPlanes
Metro Ethernet Control Metro Ethernet Control PlanesPlanes
Summary Summary Summary Summary
Infrastructure & Technology Infrastructure & Technology OptionsOptions
Infrastructure & Technology Infrastructure & Technology OptionsOptions
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 535353
New Generation of Services...
3 VoIP TerminalsVoIP
128/128 Kbps
384/384 Kbps
2 Digital TVMPEG
3072/64 Kbps
6144/128 Kbps
2 Personal ComputersWEB
512/128 Kbps
1024/256 Kbps
4 MonitoringSystems
32/128 Kbps
128/512 Kbps
Broadband AccessBroadband Access
76807680//12801280 Kbps Kbps
Telephony
Digital TVOnline
Services Surveillance
DownstreamUpstream
Totally DigitalTotally Digital Totally IntegratedTotally Integrated One Single ProviderOne Single Provider
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 545454
…But the Today’s Services are
• Ethernet Virtual Circuit
• Flexible Speed IP VPN
• Voice over IP
• Content Services
• High Speed Internet
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 555555
Layer 2 (EoMPLS or UTI/L2TPv3) EVCS Service
Office Tower
Customer B
Customer A
Customer B’s Corporate HQ
Customer A’s Corporate HQ
Cisco10720
UTI tunnel
EoMPLS tunnel
IP/MPLSCore
Cisco10720
Cisco10720
Floor 2
Floor 1
• Customers are located on different floors and connected to the HQ via UTI or EoMPLS• UTI or EoMPLS tunnel is configured on each interface the customer is homing on
VPN Solution Center
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 565656
MPLS-based IP VPN Service
CE
CE
PoP
Office Tower 2
Office Tower 1
Customer B
Customer A
Customer B’s Corporate Intranet
P
Customer A’s Corporate Intranet
Cisco 10720
Cisco 10720
PE
PE
PE
CE
CE
P
IP VPN over MPLS Backbone
VPN Solution Center
IP/MPLS Core
Cisco 10720
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 575757
Variable Bandwidth Service
• Variable bandwidth Service in increments
of 1 Mbps up to 100Mbps
• Using ‘CAR’ on both Input and output
(Ethernet interface) to limit bandwidth to
each Customer
Router
Customer A
Router
10720 Router
Switch
Regional IP Transport ringBackbone
15Mbps
Metro IP Access Ring
Customers
Customers Customers
10Mbps
Customers
Customer B
Customer C
Customer D
5Mbps
1Mbps
Hub
fa2/1
fa2/2fa2/3
fa2/4
AgendaAgendaAgendaAgenda
Market DynamicsMarket DynamicsMarket DynamicsMarket Dynamics
StandardsStandardsStandardsStandards
Metro Ethernet ServicesMetro Ethernet ServicesMetro Ethernet ServicesMetro Ethernet Services
Metro Ethernet Control Metro Ethernet Control PlanesPlanes
Metro Ethernet Control Metro Ethernet Control PlanesPlanes
Summary Summary Summary Summary
Infrastructure & Technology Infrastructure & Technology OptionsOptions
Infrastructure & Technology Infrastructure & Technology OptionsOptions
SP Latin America © 2001, Cisco Systems, Inc. All rights reserved. 595959
Metro Landscape Diversity
CustomersCustomers
SystemsSystems
Ent/SMBEnt/SMB Retail SPRetail SP ConsumerConsumer
L2 Enet VPNL2 Enet VPN
InternetInternetAccessAccess
IP VPNsIP VPNs
TDM PLTDM PL WavelengthsWavelengths
StorageStorageGbE PLGbE PL
FR/ATM VPNFR/ATM VPN
TechnologiesTechnologiesSONET/
SDHWDMEthernetEFMIP DPT/RPR
SP SegmentsSP Segments
ServicesServices
ILEC/PTTILEC/PTT IXC/T1ISPIXC/T1ISP ESPESP
Metro OpticalMetro OpticalTransport SystemTransport System
Metro OpticalMetro OpticalTransport SystemTransport System
Metro EthernetSwitching System
Metro EthernetSwitching System
Metro IPSystemMetro IPSystem
60© 2001, Cisco Systems, Inc. All rights reserved.
Paul PricePaul [email protected]