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New Member

What's the role of P in Frame-mode MPLS

3 REPLIES
Cisco Employee

Re: What's the role of P in Frame-mode MPLS

Conceptually speaking, the P router forwards packet solely based on the label information. So still from a theorical perspective, it doesn't need the whole Internet routing table.

Is that what your question was about?

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: What's the role of P in Frame-mode MPLS

The MPLS/VPN model can be running on 2 directly connected PEs routers ( on more precisely 2 E-LSRs ) without any LSR/P routers connecting them.

I've implemented such a LAB and there were no problems with MPLS-VPN connectivty across the PEs.

So does that mean that there can be no need for the P in Frame mode MLA environment??

Cisco Employee

Re: What's the role of P in Frame-mode MPLS

You don't necessarily need the P routers (non edge LSR routers). It's just that if you have any routers between your PEs (edge LSR routers), from a conceptual viewpoint they are considered as being P routers (label switches).

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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