US patent 5473599

Tony Li at
Thu May 8 01:25:22 UTC 2014

On May 7, 2014, at 12:36 AM, Eygene Ryabinkin <rea+nanog at> wrote:

> VRRP/HSRP comes from Cisco (well, VRRP is RFC'ed for some time, but
> its origin is Cisco too), 

I’m sorry, but this is 100% incorrect.  

HSRP comes from Cisco, but Cisco originally decided to not release the protocol to the IETF.  [Stupid play on their part, but water under the bridge.]  The IETF, realizing that this was useful technology, designed VRRP as a competitor to HSRP.  Once that was well on its way to standardization, Cisco realized it missed the boat and finally publicly documented HSRP.

Please get your facts straight.


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