350-501 Question #112: Real Exam Question with Answer & Explanation

The correct answer is A: OSPF. In an MPLS Segment Routing (SR-MPLS) network, an Interior Gateway Protocol (IGP) like OSPF is extended to distribute Segment Identifiers (SIDs) and associated Segment Prefixes.

MPLS and Segment Routing

Question

In an MPLS network, which protocol can be used to distribute a Segment Prefix?

Options

AOSPF
BLDP
CRSVP-TE
DEIGRP

Explanation

In an MPLS Segment Routing (SR-MPLS) network, an Interior Gateway Protocol (IGP) like OSPF is extended to distribute Segment Identifiers (SIDs) and associated Segment Prefixes.

Common mistakes.

B. LDP (Label Distribution Protocol) is used for traditional MPLS label distribution, not for distributing Segment Prefixes in Segment Routing.
C. RSVP-TE (Resource Reservation Protocol - Traffic Engineering) is used for explicit path signaling in traditional MPLS TE, not for Segment Prefix distribution in SR-MPLS.
D. EIGRP is an Interior Gateway Protocol, but it does not have standard extensions for distributing Segment Prefixes in the context of Segment Routing over MPLS.

Concept tested. MPLS Segment Routing Prefix Distribution

Reference. https://www.cisco.com/c/en/us/td/docs/iosxr/cisco_iosxr_segment_routing/segment-routing-mpls-config-guide/sr-mpls-config-guide-65x/sr-ospf.html

Topics

#Segment Routing#OSPF#Prefix-SID#MPLS

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