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8/8/2019 Ieee 0108 Mac in Mac With Big Service Tags 00

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January 2003 IEEE 802.1 Interim Meeting 1

Hierarchical LAN Services

Providing Scalability in

L2 Virtual Private Networks by usinga MAC-n-MAC Frame Encapsulation

and a Larger Service-tag

Arnold Sodder


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Authors

The following have contributed to thispresentation:

Arnold Sodder, Himanshu Shah, Tim Mancour, Jim Tsillas,

Joris Wils, Dirceu Cavendish, Paul Bottorff, Marc

Holness, Dinesh Mohan, Hesham Elbakoury


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Topics

Brief Description Market Potential and Advantages

Compatibility Goals


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CE CE

Hierarchical Encapsulated EthernetEthernet*

L2PEL2PE

* May be either transparent or

non-transparent with respectto CE defined VLANs

Ethernet*

CE Customer Edge Device (standard device)

L2PE Layer 2 Provider Edge Switch

(supports HLS)

CECE


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EthernetMPLS VPN

Core

(IETF)

CE

CEMAC-in-MAC

Ethernet

(IEEE)

Ethernet

access

trunk

tunnel

MAC-in-MAC

Ethernet

CE

L2PE

PE

L2PE

PE

PE L2PE


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Alternative Architectures Initial deployments can be based on Ethernet

Allows service providers to gradually evolve from a bridged architecture to a

MPLS composite architecture

L2PEL2PE

Ethernet Ethernet

CECE

L2PE

EthernetMAC-in-MAC

L2PE

PE


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Alternatives (2)

L2PEL2PE

Ethernet Ethernet

CECE

L2PE

EthernetMAC-in-MAC

L2PE

PE PE

PE

L2PEL2PE

P

MPLS EthernetMAC-in-MAC


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Encapsulation EthernetMACDA MACSA T/L INFO CRC32

MAC-in-MACL2PE-MACDA L2PE-MACSA CE / L2PE Frame CRC32ETYPE Id/Control

MACDA MACSA 8100 INFO CRC32VLAN T/L


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Service Tag

Includes the following fields 24-bit Virtual Private Network (VPN) Identifier

3-bit Quality of Service

Other control bits as needed for example:

1-bit MAC-in-MAC indicator

1-bit OAM indicator 1-bit CRC indicator


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Market Potential

Service Providers are requesting scalable Layer 2services for Connecting POPs (MANs and WANs)

Simplicity of Ethernet Bridged Networks in

Enterprise or University campus Backbonesviewed positively

With MAC-in-MAC, LANs can be connected by

Service Provider without limiting service to router

connections


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Advantages

Large VPN Identifier number space Due to MAC-in-MAC size of MAC address table

is lower on Intermediate network elements

Customer Isolation: encapsulated customer trafficcannot gain in-band access to devices within the

service providers network

Scales network size while preserving plug-and-

play characteristics of bridging


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Compatibility Ethernet

Q-in-Q

MAC-in-MAC

Virtual Private LAN Services (IETF)

802.3 Length Issue


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Bridged Ethernet

Single .Q domain

Single MAC Address Table

No customer separation


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Switched Ethernet + Q-in-Q

Edge .Q domain and Service .Q domain separation Single MAC Address domain

Service .Q provides customer separation

Q-in-Q


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Q-in-Q + VPLS

VPLS

Q-in-QQ-in-Q

VPLS connects Q-in-Q islands VPLS connections can be inter or intra service provider

Single MAC address domain

VPLS and Q-in-Q used to provide customer separation (Q-in-Q limited

to 4K instances)


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Switched Ethernet + MAC-in-MAC

Hierarchical MAC Address domains provide MAC addresstable scalability

Service Tag provides customer separation (much greaterthan 4K VLAN Tag limitation)

MAC-in-MAC


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Q-in-Q + MAC-in-MAC

Hierarchical MAC Address domains provide MAC address tablescalability

Service Tag provides customer separation (much greater than 4KVLAN Tag limitation)

Q-in-Q must be translated to Service Tag at boundaries

MAC-in-MAC

Q-in-Q

Q-in-Q


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MAC-in-MAC + VPLS

VPLSMAC-in-MAC

VPLS connects MAC-in-MAC islands

VPLS connections can be inter or intra service provider

Hierarchical MAC Address domains provide MAC address table scalability

Single MAC address domain for flows that traverse VPLS domain

VPLS and Mac-in-Mac used to provide customer separation (Service Tag limitis much larger than 4K VLAN limit)

MAC-in-MAC


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MAC-in-MAC + VPLS + Q-in-Q

VPLSMAC-in-MAC

VPLS connects MAC-in-MAC or Q-in-Q islands

VPLS connections can be inter or intra service provider

Hierarchical MAC Address domains provide MAC address table scalability Single MAC address domain for flows that traverse VPLS domain

MAC-in-MAC Service Tag provides customer separation, limit much larger than 4KVLAN Limit

Q-in-Q provides customer separation, limit is 4K

Q-in-Q


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802.3 Length

Proposal: Request that MAC-in-MAC besupported by full-duplex Ethernet only and

the frame length be extended for this subset

of interfaces.

Ieee 0108 Mac in Mac With Big Service Tags 00

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