MPLS VPNs - MPLS VPN Configuration - Configuring MP-BGP Between PEs

4 important questions on MPLS VPNs - MPLS VPN Configuration - Configuring MP-BGP Between PEs

How much iBGP relationships are needed between to PEs for MP-BGP?


Only one iBGP neighbor relationship

What commands need to be configured on PE for MP-BGP?

PE1(config)# router bgp 65001
PE1(config-router)#neighbor x.x.x.x remote-as 65001 (iBGP)
PE1(config-router)#neighbor x.x.x.x update-source lo0
PE1(config-router)#address-family vpn4
PE1(config-router-af)#neighbor x.x.x.x activate
PE1(config-router-af)#neighbor x.x.x.x send-community

Why is the command neighbor x.x.x.x update-source lo0 neccassary for MPLS VPNs?

MPLS designs use a loopback interface ad update source on the PE routers

What does the command neighbor x.x.x.x send-community?

For BGP/MPLS to send the community PA

Route-targets are send as BGP extended Community path attributes

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