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Different vrf interface in same router can communicate ?

Posted on 2016-07-29
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Last Modified: 2016-07-29
Hi, Here is a question. Anyone can help to answer?

Here is topology R1 ------ (e1/1)R2(e1/2) ----- (e1/3)R3

R3 advertise bgp routes to R2. The interface e1/2 in R2 is vrf ABC, while e1/1 in R2 is vrf xyz. Do you think if it is possible for R2 to advertise the bgp routes to R1 through R2' e1/1?  Thank you
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Question by:eemoon
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SIM50 earned 500 total points
ID: 41734755
If I understood you correctly, than yes. It's called route leaking.  

ip vrf ABC
 rd 10:1
 route-target export 10:1
 route-target import 10:1
 route-target import 20:1
!
ip vrf XYZ
 rd 20:1
 route-target export 20:1
 route-target import 20:1
 route-target import 10:1
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Author Comment

by:eemoon
ID: 41734802
Thank you so much for your fast reply. I think you are right.

We think vrf as independent router or routing table in a physical router. The purpose of vrf is to run different routing table in one physical router. so only same vrf interface can communicate in one router. This is general situation.

Now we hope different vrf in one router can communicate. So route leaking could do that.  Can you send a link for this?  Thank you
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Expert Comment

by:SIM50
ID: 41734808
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Author Comment

by:eemoon
ID: 41734868
Thank you so much for your link.

BTW, I am new to vrf, can you confirm my below comment is correct? Thank you again

We think vrf as independent router or routing table in a physical router. The purpose of vrf is to run different routing table in one physical router. so only same vrf interface can communicate in one router. vrf is only local router concept. This is general situation.
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Expert Comment

by:SIM50
ID: 41734889
You are partially right. It is a separate instance of a routing table. Think of it as a layer 3 vlan. Unless you will give it means to talk to other vlans, it will remain isolated. VRF is not a local router concept, it can  expand through the whole network, just like a vlan.
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Author Comment

by:eemoon
ID: 41734895
Excellent explanation! Thank you
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