[c-nsp] IP GRE tunnel up/down

[Rick Burts]

In my experience if the router has an entry in its routing
table for the destination then the GRE tunnel will show as
up/up. But if for some reason the router does not have an
entry in its routing table for the destination then the
GRE tunnel will show as up/down.

HTH

Rick

On 7/13/2011 2:11 PM, Gert Doering wrote:
> Hi,
>
> On Wed, Jul 13, 2011 at 12:20:17PM -0400, Matthew Huff wrote:
>> If it cannot make the original connection it will show up/down
>
> There is no connection to be made for a GRE tunnel.
>
>> Can you route from the source to the tunnel destination and are there any firewalls that would block the GRE protocol?
>> Can the destination route back to the source loopback1?
>
> All not relevant, unless "tunnel keepalive" is active.
>
> Normally, the tunnel is down if either source or destination IP are not
> set (like "loopback1 has no IP") or if there is no route to the destination
> IP address.
>
> gert
>
>
>
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