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Untagged Labels Coming Instead Of POP Labels

Problem Description

In the given scenario loopbacks are advertised as /24 subnet. So local router will advertise loopback0 as implicit null to it adjacent neighbours with pop tag but the adjacent routers are receiving untagged entries.

For simplicity I am using R1 to capture all the outputs. In the given outputs I am verifying loopback 0 of router 3.