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. |