ICMP MTU exceed error message generation for labeled MPLS packets - Layer 3 VPN and static LSPs

We now support ICMP error message generation for MTU exceed errors in an MPLS environment. If a MPLS labeled packet failure occurs at the egress interface of the core or transit nodes due to MTU exceed errors, an ICMP error message is received at the source or Customer Edge devices. To enable ICMP MTU exceed error message generation, you need to include the icmp-tunnelling configuration statement at the [edit protocol mpls] hierarchy on the core routers. RFC3032 defines ICMP tunnel mechanism to handle ICMP error message generation for MPLS packets for TTL expiry and MTU exceeded exceptions.