A network team is designing a Layer 3 Data Center Interconnect between two data centers. There is a requirement for all links of equal bandwidth be utilized have automatic failover and not use any…

The correct answer is E. equal cost multipath routing. Equal Cost Multipath (ECMP) routing allows a router to simultaneously forward traffic across multiple paths that have the same routing metric. Traffic is load-balanced across all equal-cost links, and if one fails, traffic automatically shifts to the remaining paths - without…

Advanced Data Center Networks

Question

A network team is designing a Layer 3 Data Center Interconnect between two data centers. There is a requirement for all links of equal bandwidth be utilized have automatic failover and not use any bundling technology. Which routing function must be used to achieve this requirement?

Options

Avirtual links
Bvirtual private LAN service
Cpolicy-based routing
DBGP route reflectors
Eequal cost multipath routing

How the community answered

(24 responses)

A
4% (1)
B
8% (2)
D
13% (3)
E
75% (18)

Explanation

Equal Cost Multipath (ECMP) routing allows a router to simultaneously forward traffic across multiple paths that have the same routing metric. Traffic is load-balanced across all equal-cost links, and if one fails, traffic automatically shifts to the remaining paths - without requiring EtherChannel, LAG, or any link bundling. Virtual links (A) are OSPF constructs for connecting discontiguous areas. VPLS (B) is a Layer 2 VPN technology. Policy-based routing (C) requires manual configuration per flow. BGP route reflectors (D) reduce iBGP full-mesh requirements and are not a load-balancing mechanism.

Topics

#ECMP#Layer 3 DCI#load balancing#data center interconnect

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