Refer to the exhibit. R1 and R5 routers are not directly connected. Loopback 0 is configured as LDP router id for both R1 and R5 routers. Loopback 0 IPv4 addresses are reachable between R1 and R5 routers. The LDP session between R1 and R5 is not established. There is no access-list applied in any routers in the path between R1 and R5. Which is the reason the LDP session is not working?
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