[c-nsp] Selective IP->MPLS TTL Propagation?

[David Freedman]

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This has probably been asked before, but how is it possible to control
the abstractive propagation of the TTL from the IP to the MPLS layer?
(without using traffic-eng tunnels in any way)

The reason for my question is that we have customers sharing a PE,
some would like to "hop-hide" along a particular LSP unidirectionally
(and are aware of how painful it can make things to troubleshoot from
their point of view), others want to see every hop along the LSP.

The "no mpls ip propagate-ttl" command appears to globally affect
all IP packets received on the PE.

We have "mpls ip propagate-ttl" enabled globally everywhere and do not
want to provision a seperate PE (or L2tunnel the customer to a seperate
PE) to do this.

Are there any features in present or future releases that can / will be
able to do this on a selective basis?

I'd also like to avoid using traffic-eng tunnels to solve this as it
would make the provisioning/setup of these types of customers more
complex than it needs to be :)

The customers wanting it accept that it will only be a unidirectional
thing (i.e, tracerouting back to them will reveal all)

As much as a stupid question it seems, thanks in advance for any info.


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David Freedman
Network Engineering Department
Claranet UK Limited
http://www.clara.net
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