What is vPC keepalive?
vPC Peer-Keepalive Link – Connects both vPC peer switches and carries monitoring traffic to/from each peer switch. vPC Peer Link – Connects both vPC peer switches and carries BPDUs, HSRPs, and MAC addresses to its vPC peer. In the event of vPC member port failure, it also carries unicast traffic to the peer switch.
How do you troubleshoot a vPC?
To verify vPCs using the CLI, perform one of these tasks:
- Purpose. Command.
- show running-config vpc. Checks the status of the vPCs.
- show vpc peer-keepalive. Verifies that the vPC peers have the identical type-1 parameters.
- show vpc consistency-parameters.
- show tech-support vpc.
- show port-channel summary.
What is the difference between vPC and vPC+?
vPC connects hosts and other devices to the network. vPC+ uses a pair of physical switches, like regular vPC does. vPC+ is different, as it creates a virtual switch. The rest of the fabricpath domain sees the host as connected to this virtual switch.
How does STP work in vPC?
STP Behavior in vPC: In vPC STP provide the following function: Protect the Layer 2 network by detection and breaking any loops before vPC configuration. Provides the loop free path for non-vPC attached device. Manages the loop when vPC is added or removed.
What is the use of vPC peer-link?
A VPC peering connection is a networking connection between two VPCs that enables you to route traffic between them using private IPv4 addresses or IPv6 addresses. Instances in either VPC can communicate with each other as if they are within the same network.
How does auto recovery in VPC really work?
How does Auto-Recovery Really Work 1 Both S1 and S2 are power down simultaneously. 2 Now only one switch is able to power up say for eg. 3 S2 will wait for vPC auto-recovery timeout (default 240 seconds which can be configured using auto-recovery reload-delay x where x is 240-3600 sec) to see if either vPC peer-link comes
Is there a VPC auto-recovery feature in Nexus 7000?
Although rare but there is a chance that vPC auto-recovery feature may get you in dual active scenario. For eg, if you first lost the peer-link and then you lost the keep-alive then you will have dual active scenario. In this situation each vPC member port keeps advertising the same LACP ID as before the dual-active failure.
Is the VPC on the Cisco Nexus 5000 still running?
The vPC on the Cisco Nexus 5000 Series switch remains up and running. The global configuration, such as Spanning Tree Protocol (STP), and the interface-level configurations are included in the consistency check. The show vpc consistency-parameters global command lists all global consistency check parameters.
What causes S2 VPC to suspend its VPC?
This will cause S2 to suspend its vPC until both vPC peer-link and keepalive are up as well as consistency check is done. This will cause black holing of traffic since S2 vPC is in secondary and S1 physical links are down. It is a good practice to enable auto-recovery in your vPC environment.