@vishal-ranpariya said in Question on VRF Lite:
Thank you for excellent explanation on VRF lite.
I understood how two customers passing through same ISP router cannot communicate each other. But I want not how their traffic pass upstream and how incoming traffic is divided to them?
Cust1 __PE1 --PE2/Internet
I think I'm following but let me know if I'm not understanding your diagram correctly.
- Cust1 LAN will be routed by it's edge router (or switch) by the routing table if there is a route to it's destination.
- If the traffic is outbound, then it will be forwarded to the PE1 (VRF-lite Router) to do a VRF lookup and attaches a label for MPLS. This label will include the correct identifying info from Cust1 (usually VLAN info).
- Traffic crosses the MPLS network (WAN) to another VRF-lite Router, PE2. This router will read the label for the correct vlan information and look for the correct VLAN routing table to use.
- Router will then use a normal route lookup and to forward to the correct next hop to Cust2 LAN.
I hope this helps
Edutainer Manager, ITProTV
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