FHRP Load Balancing Behavior


vPC and [HSRP](/hot-standby-router-protocol-hsrp) do two different things.

[vPC](/nexus-what-is-vpc) allows you to interconnect two [Nexus](/nexus) switches making them appear as a single logical node to other devices.  vPC scales up the size of the Layer 2 network.

HSRP is a gateway redundancy protocol, meaning it operates on Layer 3. 

HSRP and vPC do work well together on Nexus devices.  When configured together, you have the following advantages:

* HSRP operates in an active/active arrangement.  That means that both devices forward traffic (unlike HSRP on an IOS device).  They actually perform gateway load balancing much like GLBP on IOS.
* vPC will help "tune" HSRP so that is why Cisco recommends configuring HSRP with the default settings when using vPC. In a regular HSRP configuration, you as the administrator will tune the timers to enable fast failover. When used with vPC, it is vPC that will handle the failover


Links

https://forum.networklessons.com/t/hsrp-in-vpc-between-nexus-switches/2327/2?u=lagapides

https://forum.networklessons.com/t/hsrp-hot-standby-routing-protocol/1150/143?u=lagapides

https://networklessons.com/cisco/ccie-routing-switching/glbp-gateway-load-balancing-protocol

https://networklessons.com/cisco/ccie-routing-switching/hsrp-hot-standby-routing-protocol

Nexus - using vPC with HSRP

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Nexus - using vPC with HSRP

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