Which statement about enabling segment routing for IGPs is true?

The correct answer is B. Segment routing must first be enabled globally and then under the routing process. On Cisco IOS-XR, enabling Segment Routing (SR) follows a two-step hierarchical order: it must be enabled globally first (under the 'segment-routing mpls' global configuration context), and then explicitly enabled under the specific IGP routing process (e.g., under 'router ospf' o

MPLS and Segment Routing

Question

Options

ASegment routing must first be enabled under then routing process and then globally
BSegment routing must first be enabled globally and then under the routing process
CSegment routing can be enabled only under the routing process
DSegment routing can be enabled only globally

How the community answered

(38 responses)

B
92% (35)
C
3% (1)
D
5% (2)

Explanation

On Cisco IOS-XR, enabling Segment Routing (SR) follows a two-step hierarchical order: it must be enabled globally first (under the 'segment-routing mpls' global configuration context), and then explicitly enabled under the specific IGP routing process (e.g., under 'router ospf' or 'router isis' with the 'segment-routing mpls' command). The global enablement activates the SR MPLS data plane, while the per-process configuration tells the IGP to advertise SR capabilities (SIDs, SRGB) and participate in SR label distribution. Reversing this order or skipping either step will result in SR not functioning correctly for that IGP domain.

Topics

#Segment Routing#IGP#Configuration#MPLS

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