Introduction to VPC and VSS
Both VPC and VSS are used basically to support multi-chassis ether-channel that means we can create a port-channel whose one end is device A, however, another end is physically connected to 2 different physical switches which logically appears to be one switch.
The Differentiation between both the feature set is tabled below –
|Feature specific to Nexus
|Feature specific to catalyst 6500,4500 Series
|Separate control plane for both switches.
|2 Switches merge to form 1 logical Switch with a single control plane.
|Separate IP for each switch management and configuration.
|Single IP for management and configuration of 1 Logical Unit (2 Physical Chassis)
|HSRP is required.
|First Hop Redundancy Protocol like HSRP not required.
|Separate instance of STP, FHRP, IGP, BGP etc. will be required on each physical Switch of VPC.
|Same instance of STP, FHRP, IGP, BGP etc. will be used on each physical Switch of VSS.
|Both the switches are active and work individually. Only from VPC perspective are they elected primary and secondary.
|Switches are always primary and secondary from all aspects.
|Supports L2 Port Channels
|Supports L3 Port Channels
|Supports PAGP and LACP
|Control messages are carried by CFS over Peer Link and a Peer keep alive link is used to check heartbeats and detect dual-active condition
|Control messages and Data frames flow between active and standby via VSL
Download the comparison table here.
ABOUT THE AUTHOR
I am here to share my knowledge and experience in the field of networking with the goal being – “The more you share, the more you learn.”
I am a biotechnologist by qualification and a Network Enthusiast by interest. I developed interest in networking being in the company of a passionate Network Professional, my husband.
I am a strong believer of the fact that “learning is a constant process of discovering yourself.”
– Rashmi Bhardwaj (Author/Editor)