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Carrier Class Ethernet

Carrier Class Ethernet. Metro Ethernet Forum http://www.metroethernetforum.org/ Technical documents under “Documents” tab. ?. 7. APPLICATION. 7. APPLICATION. 6. PRESENTATION. 6. PRESENTATION. 5. SESSION. 5. SESSION. 4. TRANSPORT. 4. TRANSPORT. 3. NETWORK. 3. NETWORK. 2. DATA LINK.

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Carrier Class Ethernet

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  1. Carrier Class Ethernet Metro Ethernet Forum http://www.metroethernetforum.org/ Technical documents under “Documents” tab

  2. ? 7. APPLICATION 7. APPLICATION 6. PRESENTATION 6. PRESENTATION 5. SESSION 5. SESSION 4. TRANSPORT 4. TRANSPORT 3. NETWORK 3. NETWORK 2. DATA LINK 2. DATA LINK 1. PHYSICAL 1. PHYSICAL Transmission Media (Fiber, Co-ax, Twisted Pair, etc …) The OSI Model

  3. 7. APPLICATION 6. PRESENTATION 5. SESSION 4. TRANSPORT 3. NETWORK 2. DATA LINK 1. PHYSICAL A Practical Example ——— Web Server Application Software ——— HTML (ASCII) / JPEG / GIF ——— Connection negotiation ——— Transmission Control Protocol (TCP) Operating System ——— Internet Protocol (IP) ——— Ethernet Hardware ——— Category 5 twisted copper wires

  4. 7 6 5 4 3 2 1 A Practical Example Client (initiates connection) Web Server (answers) Internet Explorer 7 Apache Web Server 6 html, jpeg html, jpeg Router Session control 5 Session control Switch tcp port 2355 4 tcp port 80 IP 65.221.43.6 3 3 IP 209.34.122.200 IP 65.221.43.1 IP 209.34.122.8 Hub 2 2 2 2 Ethernet MAC 0x001a7b21ea442 Ethernet MAC 0x000f439ab231 Ethernet MAC 0x00065e2c54df Ethernet MAC 0x0008bb154891 1 1 1 1 1 1 Cat 5 Fiber Cat 5 Cat 5

  5. 4 3 2 Logical Physical

  6. Ethernet Frame

  7. Hub: • Ethernet frame goes to all ports (port == physical interface) • Necessarily can only run half duplex • No intelligence • Obsolete -- throw them away! • Switching: • Switch "learns" which MAC addresses are on which port • Ethernet frame is forwarded out one port only • No possibility for collisions • Can run full duplex • Routing: • strips off MAC addresses (on Ethernet port) • makes forwarding determination based on IP address and route table • puts on new MAC addresses (if Ethernet)

  8. DS-3 OC-3 FE Gig-E 2xT-1 3xT-1 10Base-T T-1

  9. What’s Carrier Ethernet: defined by the MEF • Protection • 50ms Protection • End to End Path Protection • Aggregated Line & Node Protection • Scalability • Services and Bandwidth • 100,000’s of EVC’s • From Mbps to x10Gbps • Customer data integrity • Hard QoS • Guaranteed end to end SLA • End to End CIR and EIR • Business, Mobile, Residential Carrier Ethernet • Service • Management • Fast service creation • Carrier class OAM capabilities • Customer Network Management (CNM) • TDM Support • Seamless integration of TDM • Circuit Emulation Services • Support existing voice applications

  10. MEF Services Model CustomerEdge (e.g., router) (CE) CustomerEdge (CE) MetroEthernetNetwork ServiceAttributes A service is what the CE sees. The technology used inside the MEN is not visible.

  11. Each Service is a Layer 2 VPN Example showing a green serviceand a blue service. ServiceMultiplexed UNI • Frames from one customer can not leak into another customer’s service • Multiple Services at a UNI is called Service Multiplexing

  12. Pittsburgh, PA: Airport Loop customer UNI 1310nm 10.1.4.51 Park West One 10.1.4.100 Giant Eagle 10.1.4.150 Giant Eagle 1310nm 10.1.4.50 Park West Two UNI 1310nm 10.1.4.200 Giant Eagle 10.1.4.40 Single Source Roofing Ethernet Switch at Customer location 1310nm GigE 10.1.254.254 Core Switch 1550nm (greater than 20 miles) • How does MetNet keep customers packets separate? • Add another layer! Internet NMS Company Data Center

  13. VLAN ETH Connection Protocol Stacks L3 AND UP L3 AND UP Metro A End-to-End Connection MAC MAC Ingress Mapping Egress Mapping Egress Mapping Ingress Mapping VLAN VLAN VLAN ETH ETH ETH ETH ETH ETH ETH ETH ETH ETH END USER EQUIP MPLS MPLS MPLS END USER EQUIP ETH ETH ETH ETH Access Port Network Port NE Port NC Port NC Port NC Port NE Port Network Port Access Port MPLS Shim Header Network VLAN Tag Client’s Ethernet Header MPLS ETH VLAN ETH

  14. 1544 Bytes Met-Net Packet DA (6B) SA (6B) ETYPE 8100 (2B) Net VLAN (2B) D LSR MAC (6B) S LSR MAC (6B) ETYPE 8847 (2B) MPLS Shim (4B) User Ethernet Frame

  15. QOS Mechanics: This is What Net Neutrality is talking about Policer T T DE=0 DE=1 DE=0 Customer Traffic T T 000/001 010/011 110 100/101 111 DE=1 DE=1 DE=1 TDM T-1, T-3 & OC-3 Network Control Normal Business Critical Delay Sensitive S/W Adjusts WRR Weights WRR Scheduler SP Scheduler GE Network

  16. Each Logical Layer has it’s own set of header information: • Source Identifier • Destination Identifier • Type of Information • Flags • Error handle • Other: VLAN ID (2) • Priority (2) • TOS (3) • Frame Type (2) • IP Version (3) • Sequence Number (4) • Each field can potentially be used to filter, block, control, or prioritize traffic on a network.

  17. Virtual Ethernet LANs • Untagged Ethernet • common, plain vanilla Ethernet framing • Tagged Ethernet • IEEE 802.1Q format • VLANs numbered 0 - 4095 • Includes a priority field (8 bits) 802.1p • Supported by Windows 2000 and later • All devices on LAN must support tagged Ethernet frames • Frame size is slightly larger due to tag bits • Cisco ISL format • Cisco Inter Switch Link • Predates IEEE standard • Generally obsolete except in Cisco-only world • Service Provider tagging (Stacked tagging) • ITU / IEEE / Metro Ethernet Forum defined • Adds another Ethernet header in front of standard (customer) Ethernet frame

  18. MPLS Bypass Tunnel 50ms Link or Edge Node Protection X A B User LAN 1 User LAN C VLAN Based Edge Ring F D 2 E • Provisioning of the main and alternative path (Red and Green) for connection protection • Provisioning of the MPLS based bypass tunnel between the Core Switches devices

  19. What’s Carrier Ethernet: defined by the MEF • Protection • 50ms Protection • End to End Path Protection • Aggregated Line & Node Protection • Scalability • Services and Bandwidth • 100,000’s of EVC’s • From Mbps to x10Gbps • Customer data integrity • Hard QoS • Guaranteed end to end SLA • End to End CIR and EIR • Business, Mobile, Residential Carrier Ethernet • Service • Management • Fast service creation • Carrier class OAM capabilities • Customer Network Management (CNM) • TDM Support • Seamless integration of TDM • Circuit Emulation Services • Support existing voice applications

  20. Relevant Standard Bodies and Organizations IEEE: Institute of Electrical and Electronic Engineers IETF: Internet Engineering Task Force RFCs: “Requests for Comment” generally accepted rules of the Internet ITU: International Telecommunication Union MEF: Metro Ethernet Forum - Publishes industry recommendations just like the Wi-Fi Alliance and seeks adoption by IEEE and ITU - Metro Ethernet works on IEEE 802.3 - Wi-Fi Alliance work on IEEE 802.11

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