MPLS EXP BITS, PHB Router, forwarding treatement

[sarahr202]

Hi every body

I hope you guys are doing great. Reading this great book " MPLS fundamentals"   , got some question for you guys.

Let say R1 Is PHP router , it will pop  incoming label 234 before sending the plain ip packet to R2

  ---cloud---R1------R2---IP world

1) A mpls labelled packet ( labelled 234)arrives on R1 from MPLS cloud, what will R1 do next as far QOS forwarding of packet is concerened?

As R1 is PHB, it is supposed to POP label 234, will R1 do QOS forwarding ( scheduling, queing ) first based on EXP bits in label 234 and then POP label 234 ?  Please keep in mind we are not using any qos group, i am just exploring default behavior.

Thanks and have a great weekend

[Mohamed Sobair · Accepted solution]

Hello Sarah,

By Defaut, NO the PHP router in this Case R1 doesnt perform any QoS sheduling or Queing on label 234.

Once R1 recieves Label 234, it performs the POP operation before it applies QoS queing on label 234.

Regards,

Mohamed