Is there any specific reason to disable PHP?

[Muhammad Thanveer]

Hello Folks,

Today during my technical discussions with one of my colleagues I found an interesting question posed by him, 

He asked me is there any specific reason to disable PHP?

I am keen to know this, Please answer if any one has a reason? I frankly admit that  I haven't found any?

Regards

Thanveer

[Muhammad Thanveer]

So you meant to say that the EXP value which is imposed on the bottom label is also copied to TOP label by ingress router itself. DId I understood correctly?

Regards

Thanveer

[Muhammad Thanveer]

I found this

• If a packet is classified by IP type of service (ToS) or class of service (CoS) at ingress, it cannot be reclassified by MPLS EXP at egress (imposition case). However, if a packet is classified by MPLS at ingress it can be reclassified by IP ToS, CoS, or Quality of Service (QoS) group at egress (disposition case).

I am confused now.

[Emmanouil Patiniotakis]

It is the same as that we are discussing. If classification is done in ingress using MPLS you can reclassify based on ToS value on egress because the exp value stops to exist (label is teared off but IP header remains). So at egress point you cannot reclassify based on exp value. Is this clear or not?