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virtual router redundancy protocol (VRRP)

Virtual Router Redundancy Protocol (VRRP) is a redundancy method that increases the availability of the network. From the point of view of the end device, layer 3 switch redundancy is implemented with the VRRP protocol. This procedure works with two Layer 3 switches, which can be core switches that are recognized by the end device as a single switch.

If one switch fails, the second switch takes over the function of the other. For this purpose, VRRP works with floating IP addresses between the two switches. One switch has an active IP address while the other is in standby in case the active switch fails. VRRP is an IP-based protocol standardized by the Internet Engineering Task Force( IETF) and described in RFCs 2338 and 5798. The VRRP protocol is characterized by fast switching in the event of a failure, which preserves most of the running sessions. To this end, the VRRP protocol has an automatic mechanism that takes effect in the event of a failed default router. In addition, it operates with a low overhead and can use connections in a load-balanced manner. Error response times are two to three seconds, and initialization is 100 ms.

VRRP frame

VRRP frame

There are several proprietary protocols for VRRP, such as Extreme's Extreme Standby Router Protocol (ESRP), Foundry's Foundry Standby Router Protocol (FSRP), or Cisco's Hot Standby Router Protocol( HSRP).

Englisch: virtual router redundancy protocol - VRRP
Updated at: 07.05.2013
#Words: 218
Links: redundancy, method, availability, network, layer 3 switch
Translations: DE

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