When implementing MPLS Layer 3 VPNs with customers running OSPF as the CE-PE routing protocol, which situation will require a sham link to be implemented in the MPLS backbone?
A.
to connect customer sites in different OSPF areas
B.
to connect customer sites in the same OSPF area
C.
to prevent OSPF routing loops when a customer site has redundant CE-PE connections D.
answer should be
if there is a backdoor link between the CE routers, to ensure that the backdoor link is used only to back up
the primary connection through the MPLS VPN
upvoted 2 times
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FoggiestIE
5 years, 5 months ago