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Beginner

mpls bgp forwarding

Hi All,

Can anyone please explain the use of "mpls bgp forwarding". I understand that its used in Option 2 Inter AS VPN.

Ta

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Cisco Employee

Hi,

A node should understand if it can send/accept labeled packet over any interafce. When LDP is used as label distribution protocol, enabling "mpls ip" will not only enable LDP (Control plane), but also allows the LSR to send/accept labeled packet over the interface. In case of Inter-AS Option B, BGP is used as label distribution protocol between ASBRs. So the command "mpls bgp forwarding" enables ASBR to send/accept labeled packet over the configured interface (whcih is towards the other ASBR).

-Nagendra

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Cisco Employee

Hi,

A node should understand if it can send/accept labeled packet over any interafce. When LDP is used as label distribution protocol, enabling "mpls ip" will not only enable LDP (Control plane), but also allows the LSR to send/accept labeled packet over the interface. In case of Inter-AS Option B, BGP is used as label distribution protocol between ASBRs. So the command "mpls bgp forwarding" enables ASBR to send/accept labeled packet over the configured interface (whcih is towards the other ASBR).

-Nagendra

View solution in original post

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