UCS Networking 201 Deep Dive

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1 UCS Networking 20 Deep Dive BRKCOM-2003 Brad Hedlund Manish Tandon

2 Agenda Overview / System Architecture Physical Architecture Logical Architecture Switching Modes of the Fabric Interconnect Understanding Inter-Fabric traffic SAN / LAN Northbound Connections Fabric Failover Gen2 adapters QoS examples with server virtualization 2

3 Overview BRKCOM-2003_c 200 Cisco and/or its affiliates. All rights reserved. Cisco Public 3

4 Unified Computing System (UCS) Single Point of Management Unified Fabric Stateless Servers with Virtualized Adapters 4

5 Cisco UCS Networking: Physical Architecture SAN A ETH ETH 2 SAN B MGMT MGMT Uplink Ports OOB Mgmt Fabric Switch 600 Fabric A Cluster 600 Fabric B Server Ports Fabric Extenders F E X Chassis Chassis 20 F E X F E X F E X Virtualized Adapters A CNA B A CNA CNA B Compute Blades Half / Full width B200 B250 6

6 Cisco UCS Networking: Physical Architecture SAN A ETH ETH 2 SAN B MGMT MGMT Uplink Ports OOB Mgmt Fabric Switch 600 Fabric A Cluster 600 Fabric B Server Ports Fabric Extenders Virtualized Adapters F E X A Chassis CNA F E X B CNA Rack Mount FEX FEX Management Plane Compute Blades Half / Full width B200 7

7 Cisco UCS: Infrastructure Virtualization Switch port Virtualization (, vfc) Fabric Interconnect vfc vfc 2 2 Cable Virtualization (VN-Tag) DCB Ethernet Eth / Eth /2 Individual Ethernets Individual Storage (iscsi, NFS, FC) Blade or Rack Service Profile # Adapters Identity (MAC / WWN) Firmware Settings CPU MEM I/O PCIe PCIe Adapter Server Abstraction Adapter Virtualization (NIV) 8

8 Abstracting the Logical Architecture What you see What you get 600-A 600-A 600-A Switch vfc vfc Eth / Cables Chassis FEX A 0GE A FEX A 0GE A Adapter Dynamic, Rapid Provisioning State abstraction Location Independence Blade or Rack Adapter Blade vhba vnic Service Profile (Server) vhba (Server) vnic Physical Cable Virtual Cable (VN-Tag) Blade 9

9 Switching Modes of the Fabric Interconnect BRKCOM-2003_c 200 Cisco and/or its affiliates. All rights reserved. Cisco Public 3

10 Ethernet Switching Mode: End Host Spanning Tree 600 A Fabric A VNIC 0 Server 2 VLAN 0 L2 Switching LAN 3 VNIC 0 Server MAC Learning MAC Learning Server vnic pinned to an Uplink port No Spanning Tree Protocol Reduces CPU load on upstream switches Reduces Control Plane load on 600 Simplified upstream connectivity UCS connects to the LAN like a Server, not like a Switch Maintains MAC table for Servers only Eases MAC Table sizing in the Access Layer Allows Multiple Active Uplinks per VLAN Doubles effective bandwidth vs STP Prevents Loops by preventing Uplink-to- Uplink switching Upstream VSS/vPC optional Completely transparent to upstream LAN Traffic on same VLAN switched locally 4

11 End Host Mode: Unicast Forwarding Server to server traffic on the same VLAN is locally switched Uplink port to Uplink port traffic not switched Uplink Ports LAN Deja-Vu Server 2 RPF Each vnic is pinned to an uplink port / port-channel 600 Network to server unicast traffic is forwarded to server only if it arrives on pinned uplink port. This is termed as the Reverse Path Forwarding (RPF) check VLAN 0 3 Packet with source MAC belonging to a server received on an uplink port is dropped (Deja-Vu Check) VNIC 0 Server 2 VNIC 0 Server 5

12 End Host Mode: Multicast Forwarding Broadcast traffic is pinned on exactly one uplink port (or portchannel) i.e., it is dropped when received on other uplinks Uplink Ports B LAN Broadcast Listener All VLANs B All multicast groups are pinned to same uplink port (portchannel) 600 Server to server multicast traffic is locally switched RPF and deja-vu check also applies for multicast traffic 3 B VNIC 0 VNIC 0 Server 2 Server 6

13 Ethernet Switching Mode: Switch Root LAN Fabric Interconnect behaves like a normal Layer 2 switch Server vnic traffic follows VLAN forwarding 600 A MAC Learning Fabric A 3 VLAN 0 Spanning tree protocol is run on the uplink ports per VLAN Rapid PVST+ Configuration of STP parameters (bridge priority, Hello Timers etc) not supported VTP is not supported currently VNIC 0 Server 2 L2 Switching VNIC 0 Server MAC learning/aging happens on both the server and uplink ports like in a typical Layer 2 switch Upstream links are blocked per VLAN via Spanning Tree logic 7

14 Upstream Connectivity (Storage) BRKCOM-2003_c 200 Cisco and/or its affiliates. All rights reserved. Cisco Public 8

15 SAN End Host NPV Mode N-Port Virtualization Forwarding FLOGI FDISC SAN A NPIV VSAN F_Port SAN B NPIV F_Port VSAN Fabric Interconnect operates in N_Port Proxy mode (not FC Switch mode) Simplifies multi-vendor interoperation Simplifies management SAN switch sees the 600 as an FC End Host with many N_Ports and many FC IDs assigned N_Proxy N_Proxy 600-A 600-B vfc vfc 2 vfc vfc 2 Server facing ports function as F-proxy ports Server vhba pinned to an FC uplink in the same VSAN. Round Robin selection. F_Proxy F_Proxy Provides multiple FC end nodes to one F_Port off an FC Switch vhba 0 N_Port vhba Server VSAN vhba 0 N_Port vhba Server 2 VSAN Eliminates need for FC domain on UCS Fabric Interconnect All zoning on the NPIV switch, not UCS. One VSAN per F_port (multi-vendor) F_Port Trunking and Channeling with MDS, 5K 9

16 SAN End Host NPV Mode N-Port Virtualization Forwarding with MDS, Nexus 5000 SAN A SAN B F_Port Channeling and Trunking from MDS or Nexus 5000 to UCS F_ Port Channel & Trunk Server VSAN N_Proxy 600-A 600-B vfc vfc 2 vfc vfc 2 vhba 0 NPIV VSAN,2 F_Proxy N_Port vhba F_Port NPIV VSAN,2 vhba 0 vhba Server 2 VSAN 2 FC Port Channel behaves as one logical uplink FC Port Channel can carry all VSANs (Trunk) UCS Fabric Interconnects remains in NPV end host mode Server vhba pinned to an FC Port Channel Server vhba has access to bandwidth on any link member of the FC Port Channel Load balancing based on FC Exchange_ID Per Flow Loss of Port Channel member link has no effect on Server vhba (hides the failure) Affected flows to remaining member links No FLOGI required 20

17 SAN FC Switch Mode Direct Attach FC & FCoE Storage to UCS UCS behaves like an FC fabric switch Storage ports can be FC or FCoE FC FCoE SAN Optional Light subset of FC Switching features MDS MDS Select Storage ports Set VSAN on Storage ports N_Port VSAN VSAN 2 TE_Port Default zoning per VSAN F_Port No zoning configuration inputs in UCSM If connection to MDS is present: Zoning configured and pushed to UCS from MDS 600-A FC Switch 600-B FC Switch vfc vfc 2 vfc vfc 2 F_Port If not connected to MDS: Default zoning Access control via LUN Masking on Storage array Fabric Interconnect uses a FC Domain ID vhba 0 N_Port vhba Server VSAN vhba 0 vhba Server 2 VSAN 2 2

18 Direct Attach IP Storage to UCS NAS direct attached to Appliance Port port channel NetApp EMC 600-A Volume A C Appliance Port A NAS A Volume B C2 U 2 2 A 600-B A LAN U Uplink Port IP Storage attached to Appliance Port NFS, iscsi NAS appliance with redundant controller heads C & C2 Appliance ports on the same 600 can be a port channel No MCEC between 600 s Each NAS controller head owns the I/O for a given Volume Other controller head provides failover vnic 0 vnic Server Accessing Volume A vnic 0 vnic Server 2 Accessing Volume B All ports on a controller active for a given volume when attached to the same 600 Port Channel Sub-optimal forwarding possible if not careful Insure vnics are accessing Volumes local to its fabric 22

19 Fabric Failover BRKCOM-2003_c 200 Cisco and/or its affiliates. All rights reserved. Cisco Public 25

20 Fabric Failover Fabric provides NIC failover capabilities chosen when defining a service profile Traditionally done using NIC bonding driver in the OS Provides failover for both unicast and multicast traffic Works for any OS on bare metal Works for any hypervisorbased servers 600-A 600-B Physical Cable Virtual Cable FEX 0GE PHY Adapter Cisco VIC Menlo L L2 vnic L L2 0GE FEX VIRT Adapter OS / Hypervisor / VM 26

21 Fabric Failover with Bare Metal OS Slam Dunk: Cisco UCS simplifies the redundancy L 600-A L2 L2 600-B L No OS NIC Teaming configuration required Simple single NIC design MAC A MAC A Fabric failures hidden from OS NIC stays UP Server w/ Cisco VIC or Menlo vnic MAC A 600 sends gratuitous ARP Everything to gain WINDOWS / LINUX Nothing to lose Implicit MAC Learned MAC 27

22 Fabric Failover with HYPER-V Slam Dunk: Cisco UCS provides the missing redundancy 600-A L2 L2 600-B MAC A MAC C MAC B Server w/ Cisco VIC or Menlo L vnic L MAC C HYPER V soft switch MAC A MAC C MAC B Hyper-V soft switch only supports () NIC Microsoft KB Fabric Failover provides the missing redundancy Everything to gain Nothing to lose VM MAC A VM MAC B Implicit MAC Learned MAC 28

23 Fabric Failover with VMware vswitch / NK? Single NIC design option 600-A L2 L2 600-B MAC A MAC C MAC B Server w/ Cisco VIC or Menlo vnic vswitch / NK VM L MAC A vmnic0 L MAC C Service Console MAC B MAC A MAC C MAC B Redundancy Design Simplicity? () NIC Deterministic All traffic on same local fabric No Load Sharing Only () fabric used Implicit MAC Learned MAC 29

24 Recommended NK + UCS Design (2) 0GE NICs MAC Pinning - No Fabric Failover 600-A L2 L2 600-B MAC A ESXi Host vnic Eth / vmnic0 Nexus 000V MAC Pinning VM L MAC A L Mgmt vmknic MAC B vnic 2 Eth /2 vmnic MAC B 2 Sub-group 0 Sub-group PP Data pinning id 0 PP Uplink mac-pinning PP MGMT pinning id 2 x 0GE vnics x 0GE Fabric A x 0GE Fabric B MAC Pinning Easier than vpc-hm Connects to anything Steer / Localize traffic with NK pinning id White Paper: 30

25 Fabric Failover with VM FEX Slam Dunk: Cisco UCS simplifies the redundancy Default setting Cannot be disabled Single adapter per VM with Redundancy Load Sharing Alternating fabric Round Robin 600-A L2 L2 600-B Server w/ Cisco VIC MAC B MAC A L Dynamic vnic L Hypervisor Pass-Through Dynamic vnic 2 MAC B MAC A VM MAC A VM 2 MAC B Implicit MAC Learned MAC 3

26 Upstream Connectivity (Ethernet) BRKCOM-2003_c 200 Cisco and/or its affiliates. All rights reserved. Cisco Public 32

27 End Host Mode Pinning Dynamic pinning (red) Server pinned to an uplink port/port-channel automatically Load balance s across uplinks every 300 sec s may be re-pinned - New uplinks loaded - Balance :Uplink ratio Static pinning (orange) Specific pin groups created and associated with adapters Static pinning allows traffic management if required for certain applications / servers A 2 3 VNIC 0 VNIC 0 VNIC 0 Server X Server Y Oracle DEFINED: PinGroup Oracle Pinning Switching APPLIED: PinGroup Oracle 33

28 End Host Mode Individual Uplinks Dynamic Re-pinning of failed uplinks Software Driven GARP alerts network 600 A Fabric A 3 VLAN 0 Sub-second re-pinning Pinning Switching All uplinks forwarding for all VLANs GARP aided upstream convergence No STP Sub-second re-pinning No server NIC disruption L2 Switching VNIC 0 VNIC stays up Server 2 VNIC 0 MAC A vswitch / NK ESX HOST VM VM 2 MAC B MAC C 34

29 End Host Mode Port Channel Uplinks Port Channel Convergence (Hardware driven) No disruption No GARPs needed Hardware Driven Link failure Software Driven Switch failure 600 A Fabric A More Bandwidth per Uplink Per flow uplink diversity No Server NIC disruption Fewer GARPs needed Faster bi-directional convergence Fewer moving parts RECOMMENDED 3 Sub-second convergence VLAN 0 L2 Switching VNIC 0 NIC stays up Server 2 VNIC 0 MAC A Pinning Switching vswitch / NK ESX HOST VM VM 2 MAC B MAC C 35

30 End Host Mode Port Channel Uplinks Upstream switch failure & Dynamic Re-pinning Hardware Driven Link failure 600 A Pinning Software Driven Switch failure Fabric A 3 VLAN 0 Switching L2 Switching VNIC 0 Server 2 VNIC 0 MAC A VNIC stays UP vswitch / NK ESX HOST VM VM 2 MAC B MAC C 36

31 End Host Mode vpc Uplinks vpc uplinks: Hardware driven convergence for link & switch failures No disruption vpc Domain No GARPs Needed! Hardware Driven Link failure Switch failure Failures hidden from the network 600 A Fabric A 3 VLAN 0 Pinning Switching More Bandwidth per Uplink No Server NIC disruption Switch and Link resiliency Per flow uplink diversity No GARPs Faster Bi-directional convergence Fewer moving parts vpc RECOMMENDED L2 Switching VNIC 0 NIC stays up VNIC 0 Server 2 vswitch / NK ESX HOST VM VM 2 MAC B MAC C 37

32 Inter-Fabric Traffic Example () EHM VNIC 0 L3 Switching 600 A 600 B vswitch / NK Mac Pinning EHM VNIC VM steered to VNIC0 VM2 steered to VNIC VM on VLAN 0 VM2 on VLAN 20 VM to VM2 traffic: ) Leaves Fabric A 2) L3 switched upsteam 3) Enters Fabric B VM ESX HOST VM 2 38

33 Inter-Fabric Traffic Example (2) L2 Switching Cisco UCS VM-FEX Dynamic VNIC Primary fabric A Backup fabric B EHM 600 A 600 B EHM Dynamic VNIC2 Primary fabric B Backup fabric A Dynamic VNIC Dynamic VNIC 2 VM on VLAN 0 VM2 on VLAN 0 VM PTS ESX HOST VM 2 VM to VM2 traffic: ) Leaves Fabric A 2) Gets L2 switched 3) Enters Fabric B 39

34 Inter-Fabric Traffic Example (3) VNIC 0 on Fabric A VNIC on Fabric B VM Pinned to VNIC0 VM4 Pinned to VNIC L2 Switching VM to VM4: ) Leaves Fabric A 2) L2 switched upstream 3) Enters Fabric B VM on VLAN 0 VM4 on VLAN 0 EHM 600 A EHM 600 B VNIC 0 ESX HOST VNIC VNIC 0 ESX HOST 2 VNIC vswitch / NK Mac Pinning vswitch / NK Mac Pinning VM VM 2 VM 3 VM 4 40

35 Singly Attached Uplinks 7K 7K2 EHM 600 A 600 B EHM. Traffic destined for a vnic on the Red Uplink enters 7K 2. Same scenario vice-versa for Green 3. All Inter-Fabric traffic traverses Nexus 7000 peer link 4

36 Recommended Topology vpc uplinks to L3 aggregation switch End Host Mode 7K vpc Domain keepalive 7K2 vpc peer-link EHM 600 A 600 B EHM 42

37 Recommended Topology w/o vpc With 4 x 0G (or more) uplinks per 600 Port Channels EHM 600 A 600 B EHM All UCS uplinks forwarding No STP influence on the topology End Host Mode Connect 600 s with End Host Mode to Aggregation L3 switch 43

38 Recommended Topology w/o vpc With 2 x 0G uplinks per 600 EHM 600 A 600 B EHM All UCS uplinks forwarding No STP influence on the topology End Host Mode Connect 600 s with End Host Mode to Aggregation L3 switch 44

39 Disjointed Layer 2 domains BRKCOM-2003_c 200 Cisco and/or its affiliates. All rights reserved. Cisco Public 45

40 End Host Mode Disjointed L2 Domains Broadcast Link Each 600 picks ONE uplink for Broadcast/Mcst Processing DMZ DMZ 2 EHM 600 A 600 B EHM Cannot see DMZ 2 Broadcasts DMZ Server DMZ 2 Server 46

41 Switch Mode Disjointed Layer 2 Domains DMZ VLAN DMZ 2 VLAN With vpc All Links Forwarding Tag all VLANs Prune VLANs Here Switch Mode 600 A 600 B Switch Mode Common L2 VLAN DMZ Server DMZ 2 Server Assumption: No VLAN overlap between DMZ & DMZ 2 47

42 End Host Mode Disjointed Layer 2 DMZ VLAN Overlapping VLANs DMZ 2 VLAN With vpc All Links Forwarding VLAN 20 Common L2 L2 Switch L2 Switch VLANs 20-30, EHM 600 A 600 B EHM VLAN 200 VLAN Translation 20 > > 20, etc. DMZ Server DMZ 2 Server 48

43 Gen2 Adapters BRKCOM-2003_c 200 Cisco and/or its affiliates. All rights reserved. Cisco Public 49

44 Gen2 Compatibility Adapters Emulex M72KR-E (CNA) QLogic M72KR-Q (CNA) Single Emulex ASIC design Low power 3w 8 Gbps FC Emulex drivers, Eth & FC No vnic Fabric Failover NIC bonding drivers Single QLogic ASIC design Lowest power 4.5w 8 Gbps FC QLogic drivers, Eth & FC No vnic Fabric Failover NIC bonding drivers 50

45 Gen2 Ethernet Only Adapters Broadcom BCM577 Intel M6KR-I iscsi acceleration iscsi offload (HBA) iscsi boot (future) TCP offload engine (TOE) Low cost 0GE No vnic Fabric Failover NIC bonding drivers SR-IOV compatible iscsi acceleration PXE Boot IEEE DCB FCoE in software No vnic Fabric Failover NIC bonding drivers 5

46 Cisco Virtual Interface Card (VIC) (Palo) Converged Network Adapter FCoE in hardware Single-OS and VM deployments 0GbE/FCoE Virtualize in hardware PCIe compliant vnic Fabric Failover Up to 58 distinct PCIe devices Ethernet vnic and FC vhba 2 nd Tier Fabric Extender For virtualization environments Bypass vswitch to deliver VN-Link in hardware Tight integration with Vmware vcenter User Definable vnics Eth 0 FC 2 FC 3 Eth 58 vnic as Hardware DVS-port QoS (8) COS based queues vnic bandwidth guarantees 8w PCIe x6 52

47 Cisco VIC: VM-FEX Logical View Fabric Interconnect A Fabric Interconnect B vfc vfc 2 FEX A FEX B Cisco VIC vhba 0 VM VM 2 VM 3 VM 4 VM 5 VM 6 VM 7 VM 50 vhba ESX HOST 53

48 Cisco VIC QoS BRKCOM-2003_c 200 Cisco and/or its affiliates. All rights reserved. Cisco Public 54

49 Cisco Virtual Interface Card: QoS FEX FEX Fabric A Cisco VIC Fabric B Strict 0GE 0GE 7 Priority TX Priority TX 7 Bandwidth Scheduler Bandwidth Scheduler VIC Mgmt 0% Strict 40% 0% 40% 0% 40% 0% 40% VIC Mgmt RR No Drop RR No Drop (8) COS Queues Limit TX GE Limit TX GE vnic vnic 2 vhba vnic 3 vnic 4 vnic 5 vnic 6 vhba 2 vnic 7 vnic 8 58 COS COS 3 COS 4 COS 5 COS COS 3 COS 4 COS 5 55

50 Cisco VIC + Hypervisor switch: QoS Fabric Interconnect A Fabric Interconnect B vfc vfc 2 vhba 0 vmnic 0 vmnic 2 vmnic 4 vmnic 6 vmnic vmnic 3 vmnic 5 vmnic 7 vhba vswitch / vds / NK MGMT VM DATA vmotion NFS F C Primary vmnic vmnic2 vmnic5 vmnic7 MP Backup vmnic0 vmnic3 vmnic4 vmnic6 MP Min BW 0% GE Max 30% 0% 0% 40% Class Bronze COS Best Effort COS 0 Silver COS 2 Gold COS 4 COS 3 56

51 Cisco VIC + VM FEX: QoS Fabric Interconnect A Fabric Interconnect B vfc vfc 2 vhba 0 vmknic 0 VM VM 2 VM 3 VM 4 vmknic vmknic 2 vhba Port Group MGMT APP APP 2 vmotion NFS F C Min BW 0% GE Max 0% 20% 0% 0% 40% Class Bronze COS Best Effort COS 0 Plat COS 6 Silver COS 2 Gold COS 4 COS 3 57

52 Other UCS Networking Features SPAN (Monitoring Port) PVLAN Isolated Access ports only 58

53 IPv6 BRKCOM-2003_c 200 Cisco and/or its affiliates. All rights reserved. Cisco Public 59

54 Cisco UCS: IPv6 UCS infrastructure forwards IPv6 Data Servers can be configured for IPv6 applications Fabric Interconnect forwards IPv6 data like any other Ethernet traffic UCS infrastructure Management with IPv4 only 60

55 Please complete your Session Survey We value your feedback - don't forget to complete your online session evaluations after each session. Complete 4 session evaluations & the Overall Conference Evaluation (available from Thursday) to receive your Cisco Networkers 20 th Anniversary t-shirt. All surveys can be found on our onsite portal and mobile website: You can also access our mobile site and complete your evaluation from your mobile phone:. Scan the Access Code (See for software, alternatively type in the access URL) 2. Login 3. Complete and Submit the evaluation 6

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