Which protocol does a Cisco MPLS TE tunnel use to maintain paths within the core?

The correct answer is A. RSVP. Cisco MPLS TE tunnels use the RSVP-TE protocol to establish and maintain their explicitly defined label-switched paths within the core network.

MPLS and Segment Routing

Question

Options

ARSVP
BVTP
CSTP
DRPF

How the community answered

(41 responses)

A
93% (38)
C
5% (2)
D
2% (1)

Why each option

Cisco MPLS TE tunnels use the RSVP-TE protocol to establish and maintain their explicitly defined label-switched paths within the core network.

ARSVPCorrect

BVTP

VTP (VLAN Trunking Protocol) is a Layer 2 protocol for managing VLANs on Cisco switches, which is unrelated to MPLS TE tunnel path maintenance.

CSTP

STP (Spanning Tree Protocol) is a Layer 2 protocol used to prevent loops in Ethernet networks, not for controlling MPLS TE paths.

DRPF

RPF (Reverse Path Forwarding) is a mechanism in multicast routing to prevent loops and ensure valid source paths, not for MPLS TE tunnel signaling.

Concept tested: MPLS TE signaling protocol

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_prot/configuration/xe-16/mp-te-path-prot-xe-16-book/mp-te-config-path-protection.html

Topics

#MPLS TE#RSVP-TE#Traffic Engineering#Path Maintenance

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