[c-nsp] IP GRE tunnel up/down

[Sascha Pollok]

>> 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.

Yes - or -imho- if the platform does not support it like a GSR
without a tunnel server card.

-Sascha