Which two statements about a “Virtual PortChannel graceful consistent check” are true?
A. Graceful consistency check is enabled by default.
B. When graceful consistency check is enabled, only the links on the secondary peer device are suspended.
C. Graceful consistency check is disabled by default, so to enable this feature, use graceful consistency-check command under VPC domain configuration mode.
D. When graceful consistency check is enabled, only the inconsistent VLANs on the secondary peer device are suspended.
Correct Answer: AB
Explanation/Reference:
Explanation:
Beginning with Cisco NX-OS Release 5.0(2)N2(1) and later releases, when a Type 1 mismatch occurs, by default, the primary vPC links are not suspended. Instead, the vPC remains up on the primary switch and the Cisco Nexus 5000 Series switch performs Type 1 configurations without completely disrupting the traffic flow. The secondary switch brings down its vPC until the inconsistency is cleared.
However, in Cisco NX-OS Release 5.0(2)N2(1) and earlier releases, this feature is not enabled for dual-homed FEX ports. When Type-1 mismatches occur in this topology, the VLANs are suspended on both switches. The traffic is disrupted on these ports for the duration of the inconsistency.
To minimize disruption, we recommend that you use the configuration synchronization feature for making configuration changes on these ports.
To enable a graceful consistency check, use the graceful consistency-check command. Use the no form of this command to disable the feature. The graceful consistency check feature is enabled by default.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/operations/n5k_vpc_ops.html#wp425067