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Beginner

Viptela Underlay Routing

Hi All, 

 

Anyone can explain me how Data Plane IPsec tunnels form between edges using underlay multiple default routes?

I have confused how VEdge choose the correct transport default route to reach the VEdge it want to form the tunnel.

 

 

Best Regards,

Biran

 

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2 ACCEPTED SOLUTIONS

Accepted Solutions
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Cisco Employee

Re: Viptela Underlay Routing

It's quite simple, roughly speaking, you can consider it uses route via particular color only to establish connectivity with remote vEdge. Imagine for simplicity that color = vrf in terms of IOS.

View solution in original post

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Beginner

Re: Viptela Underlay Routing

This is a good question.

 

Both underlay interfaces will be in VPN0.  While VPN0 does share a common routing table the interfaces will only use routes it learns on their local interface.  

 

Say you have gi 0 and gi 1 in VPN0.  You will never see gi 1 use a route learned on gi 0 , even if its a more specific route.

View solution in original post

5 REPLIES 5
Highlighted
Cisco Employee

Re: Viptela Underlay Routing

It's quite simple, roughly speaking, you can consider it uses route via particular color only to establish connectivity with remote vEdge. Imagine for simplicity that color = vrf in terms of IOS.

View solution in original post

Highlighted
Beginner

Re: Viptela Underlay Routing

Oh , I think I understand now. Thanks.
Highlighted
Beginner

Re: Viptela Underlay Routing

This is a good question.

 

Both underlay interfaces will be in VPN0.  While VPN0 does share a common routing table the interfaces will only use routes it learns on their local interface.  

 

Say you have gi 0 and gi 1 in VPN0.  You will never see gi 1 use a route learned on gi 0 , even if its a more specific route.

View solution in original post

Highlighted
Beginner

Re: Viptela Underlay Routing

yeah , I think color make a segmentation for vpn 0 interfaces.

Thanks for your great discussion.

 

 

 

Highlighted
Beginner

Re: Viptela Underlay Routing

"Say you have gi 0 and gi 1 in VPN0. You will never see gi 1 use a route learned on gi 0 , even if its a more specific route."

 

If gi0 is outside and gi1 inside and both of them are in vpn 0, how is it possible to get a host on gi1 to access the outside network (over the underlay, without nat)?

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