Enhanced Flow control in Ethernet Networks. Xsigo Systems 1

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1 Enhanced Flow control in Ethernet Networks Xsigo Systems 1

2 Agenda Review the proposal to support the communication of congestion information Xsigo Systems 2

3 Some Facts Ethernet has fulfilled the expectations of applications with best effort delivery model for past 3 decades Throwing more bandwidth at the problem does not solve congestion problem since queuing delays are more than wire delays Convergence of mission critical and non-mission critical applications over shared network infrastructure require traffic differentiation Is it time to enhance ethernet? Xsigo Systems 3

4 Ethernet : Is it time to enhance it? Businesses rely heavily on predictable performance of IT and network infrastructure Businesses needs more intelligent and adaptable network infrastructure to meet business needs Commoditization of compute and sharing of same network infrastructure between mission critical and non-mission critical applications require Intelligent network infrastructure with prioritization and differentiation of traffic Guaranteed performance per traffic type to meet business SLA Ethernet requires enhancements not disruptive changes Xsigo Systems 4

5 802.1p and Flow control in Ethernet Networks Server #1 Ethernet Pipe Flow Control Flow control in Ethernet Networks Ethernet Pipe 802.1p supports prioritization of the traffic Ethernet Pipe Switch #1 Flow Control Switch #2 Server #2 Flow Control Congestion Point Flow Control Ethernet Pipe Server #3 Xsigo Systems 5

6 Flow control Limitations One traffic class affect another in true loss-less fabric implementation Flow control (802.3X) does not have prioritization One VLAN traffic can block another VLAN traffic Xsigo Systems 6

7 Flow control Requirements Traffic type differentiation Congestion should be reported based on traffic types, E.g. priority, {VLAN,Pri}, other finer level flows are possible, not relevant in this group Avoid head-of-line blocking between traffic types Fairness Congestion information should be reported to all the sources who can potentially send traffic to congested destination Keep Flow control traffic as low as possible Xsigo Systems 7

8 Flow control Proposal Flow control per VLAN per priority Flow control packet per VLAN can be broadcasted back to all the sources to turnoff traffic destined to a MAC address (End node) or group of MAC addresses going through congested switch port This is in addition to link level flow control defined today Xsigo Systems 8

9 Flow control Example Xsigo Systems 9

10 Congestion Point #1 Switch #1 s output port connected to switch #2 is congested This port carry traffic for server #6, VLAN A and server #7, VLANB Ingress side of this port sends two broadcast flow control packets One on VLAN A Packet includes DMAC 6, VLAN A, Priority and time to stop etc One on VLAN B Packet includes DMAC 7, VLAN B, Priority and time to stop etc Traffic towards server #5 will not be affected Xsigo Systems 10

11 Congestion Point #2 Server #7 is congested Server #7 sends broadcast flow control packet on VLAN B to all sources belong to same VLAN Packet includes DMAC 7, VLAN B, Priority and time to stop Traffic towards any other server except #7 will not be affected! Xsigo Systems 11

12 Congestion Point #3 Server #6 is congested Server #6 sends broadcast flow control packet on VLAN B to all sources belong to same VLAN Packet includes DMAC 6, VLAN B, Priority and time to stop Traffic towards any other server except #6 will not be affected! Xsigo Systems 12

13 Congestion Point #4 Server #5 is congested Server #5 sends broadcast flow control packet on VLAN A to all sources belong to same VLAN Packet includes DMAC 5, VLAN A, Priority and time to stop Traffic towards any other server except #5 will not be affected! Xsigo Systems 13

14 Summary Ethernet needs enhancement in congestion reporting mechanism back to sources The mechanism has to be fair to all the sources Use VLAN based broadcast support to report congestion information back to sources with fairness This proposal allows to differentiate various traffic types on ethernet networks with fairness and guaranteed service Xsigo Systems 14

15 Thank You Xsigo Systems 15

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