What can be used to determine a path from the head-end to a tail-end router when implementing SR-TE with a head-end, with little information on the network topology?

The correct answer is B. path computation engine. A Path Computation Engine (PCE) is an external controller that maintains a full, global view of the network topology using the BGP-LS or similar protocols. When a head-end router has limited topology visibility - common in large or multi-domain networks - it can delegate path…

MPLS and Segment Routing

Question

Options

Atraffic controller
Bpath computation engine
Ctail-end router
DSNMP server

How the community answered

(52 responses)

A
6% (3)
B
88% (46)
C
2% (1)
D
4% (2)

Explanation

A Path Computation Engine (PCE) is an external controller that maintains a full, global view of the network topology using the BGP-LS or similar protocols. When a head-end router has limited topology visibility - common in large or multi-domain networks - it can delegate path computation to the PCE via the PCEP (Path Computation Element Communication Protocol). The PCE calculates the optimal SR-TE path and returns a label stack (segment list) to the head-end. Option A (traffic controller) is not a standard term for this function. Option C (tail-end) has no role in path computation. Option D (SNMP server) is a management protocol unrelated to SR-TE path computation.

Topics

#Segment Routing#Traffic Engineering#Path Computation Engine

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