E-VPN and Data Center |
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E-VPN and Data Center
содержание презентации «E-VPN and Data Center.ppt»| Сл | Текст | Сл | Текст |
| 1 | E-VPN and Data Center. R. Aggarwal | 7 | MAC addresses of hosts in the control |
| (rahul@juniper.net). | plane using extensions to protocols that | ||
| 2 | Reference Model and Terminology. | run between the MES and the hosts MESes | |
| “WAN”. DCS1. DCB3. DCS2. DCB1. DCS8. Data | may learn the MAC addresses of hosts in | ||
| Center 1. Data Center 3. DCS5. DCS4. | the management plane. | ||
| DCB4/DCS9. DCB2. Data Center 2. Data | 8 | E-VPN Remote MAC Address Learning. | |
| Center 4. Client Site BR. DC: Data Center | E-VPN introduces the ability for an MES to | ||
| DCS: Data center switch Connected to | advertise locally learned MAC addresses in | ||
| Servers/VMs DCB: Data center border router | BGP to other MESes, using principles | ||
| Could be co-located with DCS “WAN” | borrowed from IP VPNs E-VPN requires an | ||
| provides interconnect among DCs, and | MES to learn the MAC addresses of CEs | ||
| between DCs and Client Site BR. Client | connected to other MESes in the control | ||
| site. | plane using BGP Remote MAC addresses are | ||
| 3 | Data Center Interconnect: Layer 2 | not learned in the data plane. | |
| Extension. “WAN”. DCB3. DCS1. DCS8. DCB1. | 9 | Remote MAC Address Learning in the BGP | |
| DCS2. Data Center 3. Data Center 1. DCS5. | Control Plane Architectural Benefits. | ||
| DCB4/DCS9. DCS4. DCB2. Data Center 4. Data | Increases the scale of MAC addresses and | ||
| Center 2. Client Site BR. VLAN1 (subnet1) | VLANs supported BGP capabilities such as | ||
| stretches between DC1, DC2, DC3 and DC4 | constrained distribution, Route | ||
| VLAN2 (subnet2) is present only on DCS1. | Reflectors, inter-AS etc., are reused | ||
| VLAN3 (subnet3) stretches between DC1 and | Allows hosts to connect to multiple active | ||
| DC2 VLAN stretch is required for cloud | points of attachment Improves convergence | ||
| computing “resource fungibility”, | in the event of certain network failures | ||
| redundancy etc. Communication between VMs | Allow hosts to relocate within the same | ||
| on different VLANs/subnets and between | subnet without requiring renumbering | ||
| clients and the VMs requires layer 3 | Minimizes flooding of unknown unicast | ||
| routing. Client site. VM4. VM1. VM2. VM7. | packets Minimizes flooding of ARP Rest of | ||
| VM3. VM6. VM8. VM5. | the presentation will focus on this | ||
| 4 | BGP-MPLS E-VPNs for Data Center | Control over which MAC addresses are | |
| Interconnect. BGP-MPLS based technology, | learned by which devices Simplifies | ||
| one application of which is data center | operations; enables flexible topologies | ||
| interconnect between data center switches | etc. | ||
| for intra-VLAN forwarding i.e., layer 2 | 10 | ARP Scaling Optimization: Approach. | |
| extension Why? Not all data center | Minimize the radius of ARP | ||
| interconnect layer 2 extension | request/response propagation Minimize the | ||
| requirements are satisfied by existing | propagation radius of ARP request from a | ||
| MPLS technology such as VPLS E.g., | server/Virtual Machine In the switching | ||
| minimizing flooding, active-active points | infrastructure in the data center Across | ||
| of attachment, fast edge protection, | data centers Respond to an ARP request | ||
| scale, etc. How? Reuses several building | from a server/VM as close to the server/VM | ||
| blocks from existing BGP-MPLS technologies | as possible Requires a number of | ||
| Requires extensions to existing BGP-MPLS | components See the following slide. | ||
| technologies | 11 | ARP Scaling Optimization: Proxy ARP. A | |
| Draft-raggarwa-sajassi-l2vpn-evpn-01.txt | network node as close to the server/VM, as | ||
| Being pursued in the L2VPN WG. | possible, performs “Proxy ARP” in response | ||
| 5 | E-VPN Reference Model. RR. MES - MPLS | to ARP requests from the server/VM The | |
| Edge Switch; EFI – E-VPN Forwarding | network node should ideally be the DCS | ||
| Instance; ESI – Ethernet Segment | Which MAC address does the network node | ||
| Identifier (e.g., LAG identifier) MESes | use to respond to the ARP request? The | ||
| are connected by an IP/MPLS infrastructure | answer depends on the forwarding paradigm | ||
| Transport may be provided by MPLS P2P or | used by the node to forward packets within | ||
| MP2P LSPs and optionally P2MP/MP2MP LSPs | the VLAN MAC lookup based forwarding | ||
| for “multicast” Transport may be also be | within the VLAN/subnet The solution in the | ||
| provided by IP/GRE Tunnels. VPN A. MES 4. | following slides focuses on this IP | ||
| ESI 1, VLAN1. Host-A4. Host -A1. ESI 3, | address based forwarding within the | ||
| VLAN1. Ethernet Switch-B3. VPN A. MES 2. | VLAN/subnet Not discussed in the following | ||
| ESI 1, VLAN1. VPN B. ESI 4, VLAN2. Host | slides. | ||
| –A5. ESI 2, VLAN2. ESI 5, VLAN1. MES 1. | 12 | MESes perform Proxy ARP An MES | |
| Host-A3. VPN B. Host-B1. VPN A. MES 3. | responds to an ARP request, for an IP | ||
| EFI-A. EFI-A. EFI-A. EFI-B. EFI-B. | address, with the MAC address bound to the | ||
| 6 | Relating EVPN Reference Model to Data | IP address When the destination is in the | |
| Center Interconnect Reference Model. | same subnet as the sender of the ARP | ||
| “WAN”. DCS2. DCS1. DCS8. DCS5. DCS4. DCB3. | request The ARP request is not forwarded | ||
| DCB1. Data Center 1. Data Center 3. | to other MESes. ARP Scaling Optimization: | ||
| DCB4/DCS9. DCB2. Data Center 4. Data | The Role of E- VPN (1) When MAC lookup | ||
| Center 2. DCSes may act as MPLS Edge | based forwarding is used within a | ||
| Switches (MES) DCSes may interconnect with | VLAN/subnet. | ||
| DCBs using E-VPN DCSes are connected to | 13 | ARP Scaling Optimization: The Role of | |
| hosts i.e., VMs DCBs must participate in | E- VPN (2). How does the MES learn the IP | ||
| E-VPN although they may perform only MPLS | address bound to the MAC address when the | ||
| switching WAN routers may or may not | MAC address is remote? BGP MAC routes | ||
| participate in E-VPN Following slides will | carry the IP address bound to the MAC | ||
| describe an overview of E-VPN and then | address How does an MES learn the IP to | ||
| apply E-VPN to data center interconnect. | MAC binding when the MAC address is local? | ||
| 7 | E-VPN Local MAC Address Learning. A | Control or management plane between MES | |
| MES must support local data plane learning | and CEs or data plane snooping An MES | ||
| using vanilla ethernet learning procedures | advertises the local IP to MAC bindings in | ||
| When a CE generates a data plane packet | the MAC routes. | ||
| such as an ARP request MESes may learn the | |||
| E-VPN and Data Center.ppt | |||
E-VPN and Data Center
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