A service provider creates a network design that runs MPLS in its WAN backbone using OSPF as the IGP routing protocol.
What would be two effects of additionally implementing MPLS-TE? (Choose two.)
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A. B. C. D. E.BE.
MPLS-TE (Multiprotocol Label Switching - Traffic Engineering) is an extension of MPLS that allows network operators to steer traffic along specific paths by assigning explicit routes through the network. This provides network operators with greater control over the path that traffic takes through the network, enabling them to optimize network resources and better manage network congestion.
In the context of the service provider's MPLS-based WAN backbone that uses OSPF as the IGP routing protocol, implementing MPLS-TE would have the following effects:
A. MPLS-TE is required to reroute traffic within less than 1 second in case of a link failure inside the backbone.
MPLS-TE provides fast rerouting of traffic in the event of link failures by precomputing backup paths that can be used to quickly switch traffic to an alternate path. This is achieved by computing explicit paths for backup tunnels that can be used to reroute traffic in case of a failure in the primary path. In an MPLS-TE network, backup paths can be computed based on a variety of criteria, including link cost, available bandwidth, and delay. This provides network operators with greater control over network traffic, enabling them to minimize the impact of link failures on network performance.
E. MPLS-TE is required to create backup paths independently from the IGP.
MPLS-TE allows network operators to create backup paths independently from the IGP routing protocol. This provides greater flexibility in the management of network traffic, enabling network operators to optimize network resources and better manage network congestion. In an MPLS-TE network, backup paths can be computed based on a variety of criteria, including link cost, available bandwidth, and delay. This provides network operators with greater control over network traffic, enabling them to minimize the impact of link failures on network performance.
B, C, and D are incorrect because:
B. MPLS-TE can be used to route different MPLS QoS service classes through different paths, but this is not a requirement for implementing MPLS-TE.
C. MPLS-TE and OSPF can be used together inside one MPLS network. In fact, many service providers use OSPF as the IGP routing protocol in their MPLS networks.
D. MPLS-TE can use OSPF for the traffic path calculation. MPLS-TE can work with a variety of routing protocols, including OSPF, IS-IS, and BGP. The choice of routing protocol will depend on the specific requirements of the network and the preferences of the network operator.