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Virtual Router Redundancy Protocol (VRRP) enables you to set up a group of routers as a default gateway router (VRRP Group) for backup or redundancy purposes. This way, the PC clients can actually point to the IP address of the VRRP virtual router as their default gateway. If one of the master routers in the group goes down, one of the other routers can take over.
Routers can function as master or backup routers, and you can actually configure up to 255 virtual routers on a router interface. Of course, there are platform constraints like router memory, for instance. Additionally, VRRP is intended for use with IPv4 routers only.
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Cisco?
VRRP,stacking, and M-LAG
What is the meaning of the VRRP acronym?
The same acronym can mean different things. For example, the acronym VRRP stands for Virtual Router Redundancy Protocol or Voluntary Rescue Recognition Program, among others.
Which VRRP configuration option monitors the state of the interface and is capable of initiating a change in mastership if the monitored interface goes down?
Preempt
Why vrrp cannot be implemented in IPv6?
It is currently available in IOS-XR. Check Feature Navigator to track where else it gets implemented.
What is the purpose of VRRP?
Virtual Router Redundancy Protocol (VRRP) is a non- proprietary redundancy protocol described in RFC 3768 designed to increase the availability of the default gateway servicing hosts on the same subnet. This increased reliability is achieved by advertising a "virtual router" (an abstract representation of master and backup routers acting as a group) as a default gateway to the host(s) instead of one physical router. Two or more physical routers are then configured to stand for the virtual router, with only one doing the actual routing at any given time. If the current physical router that is routing the data on behalf of the virtual router fails, an arrangement is made for another physical router to automatically replace it. The physical router that is currently forwarding data on behalf of the virtual router is called the master router. Physical routers standing by to take over from the master router in case something goes wrong are called backup routers Kamesh (nkamesh@hotmail.com
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