Руководство По Проектированию для Cisco Cisco Nexus 5010 Switch

Design Guide

Page 2 of 38

Contents

Virtual PortChannel Technology ................................................................................................................................ 3

vPC Basics ................................................................................................................................................................ 3

vPC Peer Link ...................................................................................................................................................... 5

vPC Peer-Keepalive or Fault-Tolerant Link .......................................................................................................... 6

vPC Ports, and Orphaned Ports ........................................................................................................................... 6

vPC Topology with Fabric Extenders ................................................................................................................... 7

Traffic Flows .............................................................................................................................................................. 8

Dual-Control Plane with Single Layer 2 Node Behavior ............................................................................................ 9

Link Aggregation Group Identifier ......................................................................................................................... 9

System ID in a vPC System ............................................................................................................................... 11

Primary and Secondary vPC Roles .................................................................................................................... 11

Spanning Tree .................................................................................................................................................... 12

Cisco Discovery Protocol ................................................................................................................................... 12

Cisco Fabric Services over Ethernet Synchronization Protocol .......................................................................... 13

vPC Configuration Changes When the Peer Link Fails ........................................................................................... 13

Peer Configuration Check Bypass (for Cisco Nexus 5000 Series running NXOS version inferior to NXOS
5.0(2)N1(1)) ........................................................................................................................................................ 16

vPC Reload Restore ........................................................................................................................................... 17

vPC Configuration Consistency .............................................................................................................................. 17

vPC Consistency Checks ................................................................................................................................... 18

vPC Configuration Synchronization .................................................................................................................... 19

Duplicate Frames Prevention in vPC ...................................................................................................................... 19

vPC and Object Tracking ........................................................................................................................................ 21

In-Service Software Upgrade and vPC ................................................................................................................... 22

Interactions Between vPC and Routing ................................................................................................................... 22

HSRP Gateway Considerations .............................................................................................................................. 22

HSRP Configuration and Best Practices for vPC ............................................................................................... 22

ARP Synchronization ......................................................................................................................................... 23

Peer Gateway..................................................................................................................................................... 23

Layer 3 Link Between vPC Peers ........................................................................................................................... 24

Layer 3 Link to the Core .......................................................................................................................................... 26

Interactions with Multicast ........................................................................................................................................ 26

IGMP Snooping and vPC ........................................................................................................................................ 26

Protocol Independent Multicast and vPC ................................................................................................................ 28

vPC Failure Scenarios ............................................................................................................................................... 28

vPC Member Port Failure........................................................................................................................................ 28

vPC Complete Dual-Active Failure (Double Failure) ............................................................................................... 28

vPC Peer-Link Failure ............................................................................................................................................. 29

vPC Peer-Keepalive Failure .................................................................................................................................... 29

Examples ................................................................................................................................................................ 29

vPC with Fabric Extender Active-Active Design ..................................................................................................... 32

vPC Configuration Best Practices ............................................................................................................................ 33

vPC Domain Configuration...................................................................................................................................... 33

vPC Role and Priority ......................................................................................................................................... 33

Reload Restore .................................................................................................................................................. 34

Peer Gateway..................................................................................................................................................... 34

vPC Peer Link ......................................................................................................................................................... 35

vPC Peer Keepalive ................................................................................................................................................ 35

vPC Ports ................................................................................................................................................................ 35

LACP .................................................................................................................................................................. 36

For More Information ................................................................................................................................................. 37