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- GRE is not supported on Dell N22xx series switches and N3208PX-ON switch.
- 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 greater less than 1304.
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Generic Routing Encapsulation (GRE) is a tunneling protocol that can encapsulate almost any network layer protocol and delivers it over an IP network. GRE is defined by two tunnel endpoints, the GRE source and destination endpoint. From the common user perspective the two endpoints appear as if they are directly connected in a point-to-point configuration but in reality the packet may traverse a number of hops before it reaches the destination endpoint. The generic packet format of a GRE encapsulated packet is show in Figure 1.
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