Nexus 1000v Port-Channel Best Practices
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1 Document Number Based on Template Created By EDCS-XXXXXX EDCS-XXXX Rev X Matthew mwronkow@cisco.com Nexus 1000v Port-Channel Best Practices The Nexus 1000v requires port-channels for port-profiles containing more than one interface per host. This document describes best practices for deploying port-channels on N1k. Please let me know if your topology is not covered by the examples in this document. Modification History Rev. Date Originator Release Comment /12/11 Matthew - Original version /5/11 Matthew Added N7k lacp suspend-individual command /2/12 Matthew Added single-homed static port-channel configuration. Table of Contents Nexus 1000v Port-Channel Best Practices...1 N1k on UCS-B in End-Host mode...2 N1k on UCS-C or Rack Mount servers connected to Nexus 5k/7k switches with vpc...2 N1k on UCS-C or Rack Mount servers connected to switches without vpc...3 N1k on UCS-C or Rack Mount servers connected to 6500 VSS or stacking switches...3 N1k on UCS-C or Rack Mount servers connected to a single upstream switch using a static port-channel...4
2 N1k on UCS-B in End-Host mode Cisco UCS uses two diverse paths between the blade and upstream network. Currently, the Fabric Interconnects does not support LACP/vPC southbound toward the blades. This means a static portchannel from the N1k perspective must be used. Mac Pinning is required since the upstream switches do not support multi-chassis etherchannel. channel-group auto mode on mac-pinning # Upstream switch configuration -None required N1k on UCS-C or Rack Mount servers connected to Nexus 5k/7k switches with vpc In this topology each rack server is physically connected to two different Nexus switches one cable to each switch. LACP is the preferred mode as it allows the best traffic distribution and non-disruptive addition/subtraction of links. It is assumed the upstream Nexus switches already have a vpc peer-link configured. feature lacp lacp offload port-channel load-balance ethernet source-mac channel-group auto mode active # Nexus 5k/7k switches #1 & #2 configuration interface port-channel1000 vpc 1000
3 no lacp suspend-individual <- Nexus 7k only!!!! interface Ethernet1/11 description ESX-Host1 N1k on UCS-C or Rack Mount servers connected to switches without vpc In this topology each rack server is physically connected to two different switches but vpc is not available. The only supported configuration is mac-pinning. This configuration is identical to that used on UCS-B. A static port-channel (mode on) is not supported since the upstream switches do not support a multi-chassis-etherchannel technology. channel-group auto mode on mac-pinning # Upstream switch configuration -None required N1k on UCS-C or Rack Mount servers connected to 6500 VSS or stacking switches In this topology the upstream switches act as a single chassis. This allows N1k to connect using LACP. feature lacp lacp offload channel-group auto mode active # 6500 VSS configuration interface Port-channel1000
4 switchport interface GigabitEthernet1/1/1 description ESX-Host1 adapter 1 switchport interface GigabitEthernet2/1/1 description ESX-Host1 adapter 2 switchport N1k on UCS-C or Rack Mount servers connected to a single upstream switch using a static port-channel In this topology the servers are single-homed to an upstream switch. This topology provides no switch redundancy and is not a best practice. channel-group auto mode on # Upstream Nexus switch interface port-channel 1000!
5 interface Ethernet1/11 description ESX-Host1 channel-group 1000 mode on
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