VPC Peer link latency

[josue.espogeira]

Hi everyone,

I have two 9Ks running in standalone mode in two different DCs.

I would like to create a VPC domain between these 2 9K boxes, via 4 ISP circuits.

2 Circuits for vpc peer keepalive link and the other 2 for vpc peer-link.

Question: What is the maximum latency supported for the vpc-peer-link (across interlan)?

Thanks.

[Sergiu.Daniluk]

HI @josue.espogeira 

I would not advise you to have this type of design, where you have a vPC between two Nexus switches located in different DCs.

First, there would be no advantage in having this setup, since you cannot create vpc enabled port-channels and you are susceptible to unexpected behaviors. Plus, imagine that you have a split brain scenario, both your DCs will be impacted.

If you really want to go for active-active DCs, then look for other solutions. The easier one is to buy another pair of Nexus 9K and build a back-to-back VPC, and then take advantage of HSRP isolation: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/interfaces/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_Interfaces_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_Interfaces_Configuration_Guide_7x_appendix_011...

Stay safe,

Sergiu

[josue.espogeira · Accepted solution]

Thanks Sergiu