Cisco N7K-C7010 Configuration Guide - Page 218

Information About vPCs Chapter 7 Configuring vPCs Send document comments to [email protected] This section includes the following sections: • Configuration Parameters That Must Be Identical, page 7-16 • Configuration Parameters That Should Be Identical, page 7-17 • Consequences of Parameter Mismatch, page 7-18 Configuration Parameters That Must Be Identical The configuration parameters in this section must be configured identically on both devices of the vPC peer link; otherwise, the vPC moves fully or partially into a suspended mode. Caution When spanning tree is disabled for any VLANs irrespective of whether it is a VPC VLAN or not, it will cause a Global type 1 inconsistency causing all VPCs VLANs to be suspended. This issue is also observed when disabling spanning tree for a non-existent VLAN. Note You must ensure that all interfaces in the vPC have the identical operational and configuration parameters listed below. Note Enter the show vpc consistency-parameters command to display the configured values on all interfaces in the vPC. The displayed configurations are only those configurations that would limit the vPC peer link and vPC from coming up. The devices automatically check for compatibility for some of these parameters on the vPC interfaces. The per-interface parameters must be consistent per interface, and the global parameters must be consistent globally: • Port-channel mode: on, off, or active • Link speed per channel • Duplex mode per channel • Trunk mode per channel: - Native VLAN - VLANs allowed on trunk - Tagging of native VLAN traffic • Spanning Tree Protocol (STP) mode • STP region configuration for Multiple Spanning Tree • Enable/disable state per VLAN • STP global settings: - Bridge Assurance setting - Port type setting - Loop Guard settings • STP interface settings: - Port type setting 7-16 Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x OL-23435-03