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New Member

About the GRE Tunnel

Is this a true Cisco statemenet?

GRE tunnel encapsulation and deencapsulation for multicast packets are handled by the hardware in PFC3. Each hardware-assisted tunnel must have a unique source. Hardware-assisted tunnels cannot share a source even if the destinations are different.

3 REPLIES
Hall of Fame Super Gold

Re: About the GRE Tunnel

It's true.

New Member

Re: About the GRE Tunnel

So the unique source address can be any pingable interface and don't have to be a loopback, is that correct?

Hall of Fame Super Gold

Re: About the GRE Tunnel

In our case, we had two WAN links to our routers.  Tunnel 0 source is F0/0 (/30) and Tunnel 1 source is F0/1 (/30).

Does this make sense?

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