Failover Detection Protocol for ECMP Routing in VMware NSX-T Data Center
Question
An NSX administrator wants to create a Tier-0 Gateway to support equal cost multi-path (ECMP) routing.
Which failover detection protocol must be used to meet this requirement?
Answers
Explanations
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A. B. C. D.D.
To support Equal Cost Multi-Path (ECMP) routing with Tier-0 Gateway in NSX-T Data Center, the administrator must choose a failover detection protocol that can quickly detect link or device failures and switch traffic to an alternate path. The failover detection protocol must also support multiple paths to the same destination with equal cost.
Out of the given options, only Virtual Router Redundancy Protocol (VRRP) and Bidirectional Forwarding Detection (BFD) are suitable for this requirement.
VRRP is a protocol used for gateway redundancy. It allows multiple routers to share a virtual IP address and MAC address, acting as a single gateway. If one of the routers fails, another router in the group takes over the virtual IP address and MAC address. VRRP is commonly used for failover in Layer 3 networks and is supported by NSX-T.
BFD is a protocol used for detecting link or device failures in a network. It provides rapid detection of failures and enables faster failover than other protocols. BFD works by sending periodic packets between two devices to monitor the link status. If the packets stop being received, BFD declares the link as down and triggers failover to an alternate path. BFD is also supported by NSX-T.
Therefore, the correct answer for this question is D. Bidirectional Forwarding Detection (BFD). BFD is the most appropriate protocol for supporting Equal Cost Multi-Path (ECMP) routing with Tier-0 Gateway in NSX-T Data Center.
