352-001 Question #803: Real Exam Question with Answer & Explanation

The correct answer is D: affinity. MPLS TE affinity (administrative groups) is the attribute that constrains which links a TE tunnel can traverse by matching configured bit masks on tunnels and links.

Question

Which MPLS attribute is required or links to carry a given Cisco MPLS TE tunnel?

Options

Anext hop backup tunnel
Btunnel path-selection metric
CTE tunnel destination address
Daffinity

Explanation

MPLS TE affinity (administrative groups) is the attribute that constrains which links a TE tunnel can traverse by matching configured bit masks on tunnels and links.

Common mistakes.

A. Next-hop backup tunnel is an FRR protection mechanism for rerouting traffic around failures, not an attribute that links a TE tunnel to specific paths.
B. Tunnel path-selection metric affects which metric (TE or IGP) CSPF uses to compute the path, but it does not link or constrain which specific links carry the tunnel.
C. The TE tunnel destination address is a required endpoint configuration parameter, but it is not the attribute that administratively links the tunnel to specific network links.

Concept tested. MPLS TE affinity and administrative group path constraints

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_control/configuration/xe-16/mp-te-path-control-xe-16-book/mp-te-affin-attr-grp.html

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