the correct behaviour and all options are described in RFC 3443. Mainly there are two options you can configure in a Cisco PE:
R(config)#mpls ip propagate-ttl
This is the default. The reduced IP TTL will be used in all imposed labels by the PE. Then in the MPLS network, label TTL are decreased and IP TTL is unmodified until the IP packet is forwarded without labels. Then the last lael TTL decremented by one will be used in IP header. The main idea is, that a traceroute will still show all hops in the proper order.
The second option is:
R(config)# no mpls ip propagate-ttl forwarded
This will set the label TTL to 255 for Customer traffic and thus transparently tunnel the IP TTL through the MPLS domain. This allows to hide MPLS core routers from customers. Nice feature for a SP.
The Cisco EPN system incorporates a network architecture designed to consolidate multiples services on a single Multiprotocol Label Switching (MPLS) transport network. This network is designed primarily based on Application Engineered...
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Cisco Software Manager Server
This document describes the programmatic interfaces, RESTful APIs, which are supported by Cisco Software Manager Server (CSM Server).
CSM Server supports a set of finite RESTful APIs. The fir...