>> Do I have to set also MTU on interface tunnel1?
yes I would try so
>> s there a possibility that packet fragmentation will occur if I don't configure MTU well?
this is likely to happen without tuning
Note: be aware that in a recent thread an important limit of GRE on C6500 (and I suppose on C7600) has been pointed out: if multiple point to point GRE tunnels have to created, each needs to have a different local endpoint in order to take advantage of HW assisted GRE forwarding.
The initial poster of that thread had multiple tunnels sourced by a single loopback and he could see main cpu rising quickly for this limitation
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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