Question

A service provider engineer is configuring an RSVP-TE tunnel from PE1 to PE4 across an IS-IS core. The requirement is that the tunnel must traverse the router P2 (loopback 10.0.0.2) for regulatory reasons, but the path between the ingress and P2, and between P2 and the egress, should be computed dynamically by the ingress CSPF engine. Which explicit-path configuration approach satisfies this requirement?

Accepted Answer

Define an explicit-path listing only 10.0.0.2 as a loose next-address hop, allowing CSPF to expand the remaining hops.

Answer

Define an explicit-path listing every core link address as strict next-address hops, including 10.0.0.2.

Answer

Configure the tunnel with a dynamic path option only and apply an affinity/administrative-group bitmask that matches P2.

Answer

Configure the tunnel autoroute announce so IS-IS SPF forces traffic through P2 automatically.