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ICMP Post MPLS (RFC 3032) When an LSR receives an MPLS encapsulated datagram that it can’t deliver It removes entire MPLS labels stack It sends an ICMP message to datagram’s originator The ICMP message indicates why the datagram couldn’t be delivered (e.g., time expired, destination unreachable) The ICMP message also contains the IP header and leading 8 octets of the original datagram RFC 1812 extends this to “as many bytes as possible” |