A network administrator is configuring VRRP to avoid a traffic black hole when the transport side of the network is down on the primary device.
What must be configured to get the fastest failover to standby?
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A. B. C. D.D.
https://sdwan-docs.cisco.com/Product_Documentation/Software_Features/SD-VRRP (Virtual Router Redundancy Protocol) is a protocol that provides a virtual IP address to a group of routers. One router is designated as the primary router, and the others are standby routers. The primary router is responsible for forwarding traffic sent to the virtual IP address. In case the primary router fails, one of the standby routers will take over as the new primary router.
To avoid a traffic black hole when the transport side of the network is down on the primary device, the standby router should take over as the new primary router as soon as possible. The following are the options available for configuring VRRP to get the fastest failover to standby:
A. OMP (Overlay Management Protocol) tracking: OMP tracking is a feature that allows the VRRP priority of a router to be adjusted based on the state of the overlay network. If the overlay network is down, the priority of the router will be reduced, allowing the standby router to take over as the new primary router. Using OMP tracking can help ensure that the VRRP failover happens quickly.
B. Higher group ID number: VRRP routers with a higher group ID number will have a higher priority than routers with a lower group ID number. Configuring a higher group ID number on the standby router can ensure that it has a higher priority than the primary router, so that it can take over as the new primary router in case of a failure.
C. Prefix-list tracking: Prefix-list tracking is a feature that allows the VRRP priority of a router to be adjusted based on the status of a prefix list. If a particular prefix is not reachable, the priority of the router will be reduced, allowing the standby router to take over as the new primary router. Using prefix-list tracking can help ensure that the VRRP failover happens quickly.
D. Lower timer interval: The VRRP hello timer interval determines how often VRRP routers exchange hello messages to ensure that they are still operational. Lowering the timer interval can help ensure that the failover to standby happens quickly in case of a primary router failure.
In conclusion, to get the fastest failover to standby in VRRP, a network administrator should consider using OMP tracking, configuring a higher group ID number, using prefix-list tracking, and/or lowering the timer interval. The best option may depend on the specific network environment and requirements.