•
All Fabric Extender host interfaces run as spanning tree edge ports with BPDU Guard enabled and you
cannot configure them as spanning tree network ports.
•
You can connect servers that use active/standby teaming, 802.3ad port channels, or other host-based
link redundancy mechanisms to Fabric Extender host interfaces.
•
Any device that is running spanning tree connected to a Fabric Extender host interface results in that
host interface being placed in an error-disabled state when a BPDU is received.
•
You can connect any edge switch that leverages a link redundancy mechanism not dependent on spanning
tree such as Cisco FlexLink or vPC (with the BPDU Filter enabled) to a Fabric Extender host interface.
Because spanning tree is not used to eliminate loops, you should ensure a loop-free topology below the
Fabric Extender host interfaces.
Ingress and egress packet counters are provided on each host interface.
For more information about BPDU Guard, see the Cisco Nexus 7000 Series NX-OS Layer 2 Switching
Configuration Guide.
Host Interface Port Channels
Layer 3 Host Interface Port Channels
The Fabric Extender (FEX) supports host interface port channel configurations. You can combine up to 8
interfaces in a standard mode port channel and 16 interfaces when configured with the Link Aggregation
Control Protocol (LACP).
Port channel resources are allocated when the port channel has one or more members.Note
All members of the port channel must be FEX host interfaces and all host interfaces must be from the same
FEX. You cannot mix interfaces from the FEX and the parent switch.
Layer 3 mode is supported on host interface port channels.
A host interface port channel also supports subinterfaces. You can create up to 1000 subinterfaces on a FEX
host interface port channel.
For more information about port channels, see the Cisco Nexus 7000 Series NX-OS Interfaces Configuration
Guide.
Layer 2 Host Interface Port Channels
The Fabric Extender supports host interface port channel configurations. You can combine up to 8 interfaces
in a standard mode port channel and 16 interfaces when configured with the Link Aggregation Control Protocol
(LACP).
Port channel resources are allocated when the port channel has one or more members.Note
Cisco Nexus 2000 Series NX-OS Fabric Extender Software Configuration Guide for Cisco Nexus 7000 Series
Switches, Release 5.2
4
Overview
Host Interface Port Channels
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