Cisco Multi-VRF CE or VRF Light

Ref :

AA- The first ref does not address clearly how to connect a Multi-VRF CE

to a PE using eBGP .

The 2nd Ref (page 11-9) provide a template .

Any doc which list a complete config for Multi-VRF CE using

ebgp to connect to a PE router ??

BB-from ref 2 : say for 5 VRF on the CE , is it mean a ebgp session per

VRF between the CE and the PE ??

Could be easier if the CE and PE run a modified eBGP VPNV4 .

a modified in the sense :

At the PE :

Say the 5 VRF are VRf1 ...VRF5

interface s1

ip Vrf Forwarding Vrf1,Vrf2,Vrf3,Vrf4,Vrf5

address-family VPNV4 VRF vrf1,Vrf2,Vrf3,Vrf4, Vrf5

Nei CE remote-as XXX

...

a VPNV4 context is configured per VRF(s) and an interface could be

linked to several VRF's .

For outgoing eBGP update : advertise route from those VRF routing table , no RT ext-community will be exported .

For incoming eBGP update : import the route to the correspending

VRF based on the RD value .

(Those recieved eBGP VPNV4 update are within the context of the sepcified VRF (Vrf1 ...VRf5) which mean that they are not propagated to

other PE's ) .

at the CE :

Addrres-family VPNV4 vrf vrf1,vrf2,vrf3,vrf4,vrf5

nei PE remote-as YYY

....

In such case their is no need to have a sub-interface for each VRF between the CE and the PE , Separation of VRF traffic is now based on the label .

(May be the above is something like Inter-AS RFC 2547 option "a" but

now is VRF's-to-VRF's instead of VRF-to-VRF still it is not full fledge

as option "c" or option "b" )

CC- For a Multi-VRF over a CE where it is connected to PE using

eBGP (one eBGP session per VRF) ,it is not clear the benefit

(in term of mem and CPU ) of such setup versus the CE runing full PE-functionality . Pls clarify .

Brgds

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