Cisco Systems N5KC5596TFA manual Graceful Type-1 Check

Configuring Virtual Port Channels

Graceful Type-1 Check

Note To ensure that none of the vPC interfaces are in the suspend mode, enter the show vpc brief and show vpc consistency-parameterscommands and check the syslog messages.

Configuration Parameters That Should Be Identical

When any of the following parameters are not configured identically on both vPC peer switches, a misconfiguration may cause undesirable behavior in the traffic flow:

•MAC aging timers

•Static MAC entries

•VLAN interface—Each switch on the end of the vPC peer link must have a VLAN interface configured for the same VLAN on both ends and they must be in the same administrative and operational mode. Those VLANs configured on only one switch of the peer link do not pass traffic using the vPC or peer link. You must create all VLANs on both the primary and secondary vPC switches, or the VLAN will be suspended.

•Private VLAN configuration

•All ACL configurations and parameters

•Quality of service (QoS) configuration and parameters—Local parameters; global parameters must be identical

•STP interface settings:

◦BPDU Filter

◦BPDU Guard

◦Cost

◦Link type

◦Priority

◦VLANs (Rapid PVST+)

To ensure that all the configuration parameters are compatible, we recommend that you display the configurations for each vPC peer switch once you configure the vPC.

Graceful Type-1 Check

Beginning with Cisco NX--OS Release 5.0(2)N2(1), when a consistency check fails, vPCs are brought down only on the secondary vPC switch. The VLANs remain up on the primary switch and Type-1 configurations can be performed without traffic disruption. This feature is used both in the case of global as well as interface-specific Type-1 inconsistencies.

This feature is not enabled for dual-active FEX ports. When a Type-1 mismatch occurs, VLANs are suspended on these ports on both switches.

Cisco Nexus 5000 Series NX-OS Interfaces Configuration Guide, Release 5.2(1)N1(1)

78-26881-OL 73