A small network when turning on MPLS Distribute Default Route, all traffic stops going in/out till the check is turned off. While off, outbound traffic does not use MPLS, and the edge router, even though MPLS has a forwarding database does not show any traffic going via MPLS.
, MCTCE, MTCNA, MCTCTE, MTCWE, MTCNIE, A+, N+, MCP, MTCSE Mikrotik Certified Consultant / Trainer
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-- Author of "Learn RouterOS: Second Edition"