While you MPLS score is using Cisco Routers, the core of a company you have acquired is not. After extending your MPLS VPN networks by integrating the cores, you discover that the end-to-end LPS path between PE routers can’t be established. Which of the following may have caused this problem?
A.
The BGP protocol versions do not match
B.
The MTUs do not match
C.
You are using Cisco Proprietary TDP in your existing core
D.
MPLS is not supported between different vendors
E.
MP-BGP is not supported between different vendors