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sham-link endpoint advertisement

enderkaran
Level 1
Level 1

can you pls help me to understand why below sentence is true ? why we can not advertise endpoints via OSPF ?

iBGP, not OSPF, must always advertise the sham link endpoints

1 Reply 1

Peter Paluch
Cisco Employee
Cisco Employee

Hello,

can you pls help me to understand why below sentence is true ?

Because otherwise, it would be a chicken-and-egg problem. The sham-link is configured using the opposite PE's IP address in a particular VRF - it is basically a targeted OSPF session between two distant PEs. Assuming that you want OSPF to carry this IP address, you have an unsolvable situation: without knowledge where this IP address is located, the sham-link can not go up, and if the sham-link can not go up, you can not find out where this IP address is located.

Best regards,

Peter

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