[mpls] error response to mpls data packets

["anshu " <anshu.mpls at rediffmail.com>]

Hi,
MPLS LSPs can span across different type of networks.
Suppose LSP spans across R1,R2,R3 and R2 is not part of IP networks.
In that case how will the forwarding error is handled at R2 (incase its part of IP, ICMP error
message can be sent to the source). I could not find any standard specs which talks about any generic
implementation.

Regards,
Anshu

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