- GRE is not supported on Dell N22xx series switches and , N3208PX-ON switch and FS S5860 series switches.
- PicOS GRE supports tunneling of IPv4 over IPv4 and IPv6 over IPv4.
- One GRE tunnel source address and destination address form an address pair. Different GRE tunnels cannot be configured with the same address pair.
- In the same VRF, it is not allowed to configure different GRE tunnel interface addresses with the same network segment IP address.
- If a large number of static routes for the GRE tunnel are configured and committed at one time, the background process will take several minutes to successfully complete all these configurations, although the print may immediately show that the commit is OK.
- On AS4610 serial switches, the number of static routes for the GRE tunnel should be not more than 20.
- By default, the MTU value of an L3 interface is 1500. If you want to change the MTU value of the GRE tunnel source interface, its value should be less than 1304.
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