MPLS-VPN network

[jack george]

Hi i have a case in witch i implement MPLS-VPN network and i just want to know how P routers pass packets of networks that exist in VRF tables in PE routers even though VRF tables exist in PE routers only not P routers also bgp table not have vrf networks as they are separated so distribution not work (note that: core routers run ospf while between PE-CE run ebgp)

[daniel.dib · Accepted solution]

Hi,

The P routers do not need VRFs or VPN labels because they are only transporting the packets towards the PEs. They do this by looking at the IGP label. This label is advertised by LDP. This is sometimes referred to as BGP free core. Although you will often have BGP running for other purposes on the P router.

Daniel Dib
CCIE #37149

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