Refer to the exhibit.
CE1 and CE2 cannot communicate through the service provider BGP peering is established between PE1 and PE2. IS-IS is the only routing protocol running in the service provider core .
What step can be done to troubleshoot the issue?
A . Switch the IGPs running in the core from IS-IS to OSPF to support a Cisco MPLS TE tunnel from PE1 to PE2.
B . Configure BGP between CE and PE routers.
C . Confirm that IS-IS is running with metric-style narrow.
D . Verify the MPLS LSPs.
Answer: D
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