How to reconfigure from a normal STP configuration to a VPC?

[wjsenqkf2]

Hello.

I have a question.

We are using two N3548s consisting of STP and HSRP.
N3548 is connected to each other by Port-Channel (10G * 2)
And there's a firewall at the top, and a server at the bottom of each N3548.

We want to migrate from this configuration to VPC.
When configuring a VPC, there must be no break time for the service.
Never lose a second.

I did the test. The other settings have no effect on the service
(VPC Features and Keep-alive)

But when i entered the command "vpc Peer-Link" in Port-ChannelPort-Channel on N3548 (Acieve).
The Port on N3548(Standby)' Port-Channel is blocked by STP (BKN) when entered.
And servers connected to N3548 (Standby) become service down.

Because the port-Channel port is STP (BKN), packets from servers connected to the standby cannot go to N3548 (Active).

I think this is BKN because the peer-Link setting is only on one side.

I have to migrate to VPC so that there is no service impact in Standby.

Is there a way?

Thanks.

[shaps]

You can try and build the peer link alongside the current port channel and create VPC members ports and then migrate over the servers and remove the port channel. Possible it will work but it is alway best to build a VPC from scratch before adding live services.

[wjsenqkf2]

Thanks for your reply.
Current servers are not controllable and must be solved with switch control only.
I am still testing.
Thank you.

[networkcheff]

Configure a fresh VPC and migrate the connection.

Hitless vPC Role Change

The vPC hitless role change feature provides a framework to switch vPC roles between vPC peers without impacting traffic flows. The vPC role swapping is done based on the role priority value of the device under the vPC domain. A vPC peer device with lower role priority is selected as the primary vPC device when the"vpc role preempt"command is executed.

Please see Use Case Scenario for Hitless vPC Role Change for more details.

Check if this helps you.