350-501 · Question #112
In an MPLS network, which protocol can be used to distribute a Segment Prefix?
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.
Question
In an MPLS network, which protocol can be used to distribute a Segment Prefix?
Options
- AOSPF
- BLDP
- CRSVP-TE
- DEIGRP
How the community answered
(23 responses)- A91% (21)
- C4% (1)
- D4% (1)
Why each option
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.
OSPF, as an IGP, is commonly used in Segment Routing over MPLS (SR-MPLS) to advertise Segment Identifiers (SIDs), which include Segment Prefixes, using extensions like OSPFv2 or OSPFv3 Segment Routing extensions.
LDP (Label Distribution Protocol) is used for traditional MPLS label distribution, not for distributing Segment Prefixes in Segment Routing.
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.
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
Source: 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
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