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mpls ipv4 label distribution by bgp which is the new feather


the following URL provide the latest feature about inter-as MPLS/VPN which is worth discussing:

I have some confusion about the sample configration:

1) ASBR2 propagtes ff (PE2 loopbak address)route and lable to ASBR2

,wheather asbr1 would allocate a new lable to ff and send it to the rr1?

2) How many layer lables the pe1 shall add to the vpn stack in order to reach the destination behinde PE2?I think it should three layers (one for VPN,one to destination ff which is assinged by ASBR1 and the third layer is lable to xx which is the ASBR1?

Please give me a answer. THank you in advance.


Re: mpls ipv4 label distribution by bgp which is the new feather

1) In my opinion, the ASBR1 will allocate a new label for the PE2 loopback address but would swap it and not allocate a new level of label.

2) I think it would still be only 2 layers of labels to reach between PE1 and PE2.

Any other thoughts?