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GRE packet matching and routing

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01Boxer
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Level 1

‎03-31-2015 07:53 AM - edited ‎03-07-2019 11:20 PM

Hi,

I'm trying to confirm some details on GRE tunnelling, I hope someone knows the answer to, or can point me in the right direction, please?

Firstly, is traffic still encapsulated and GRE packets routed according to the underlying network routing, even if the destination router of the tunnel is unavailable (failed)?

Secondly, when the source router has a route-map (referencing an ACL) to match traffic, will matching traffic always be encapsulated and sent onto the network?

I know these are sort of similar questions, I'm trying to understand possible failure scenarios from source to destination.

Thanks in advance!

:)

 

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dangleminh
Level 1
Level 1

‎04-01-2015 01:12 AM

Firstly, is traffic still encapsulated and GRE packets routed according to the underlying network routing, even if the destination router of the tunnel is unavailable (failed)?

=>If the GRE tunnels destination is down, the route will be withdrawn, service impact. The underlying network does not know about routing.

 

Secondly, when the source router has a route-map (referencing an ACL) to match traffic, will matching traffic always be encapsulated and sent onto the network?

=>All traffics will be encapsulated as long as they are routed via GRE tunnel.

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