116| Network Configuration Parameters AOS-W 6.5.3.x| User Guide
2. The frame is encapsulated in a GRE packet.
3. The GRE packet enters the network on VLAN 10, is routed across the network to the destination switch
(Switch-2), and then exits the network on VLAN 20.
The source IP address of the GRE packet is the IP address of the interface in VLAN 10 in Switch 1.
4. The frame is de-encapsulated and bridged out of the destination switch (Switch-2) on VLAN 101.
About Layer-3 GRE Tunnels
The benefit of Layer-3 GRE tunnels is that broadcasts are not flooded through the tunnel, so there's less
wasted bandwidth and less load on the switches. The forwarding method for a Layer-3 GRE tunnel is routing.
By default, GRE tunnels are in IPv4 Layer-3 mode.
Figure 18 IPv4 Layer-3 GRETunnel
Figure 19 IPv6 Layer-3 GRETunnel
IPv6 encapsulated in IPv4 and IPv4 encapsulated in IPv6 are not supported. The only Layer-3 GRE modes supported
are IPv4 encapsulated in IPv4 and IPv6 encapsulated in IPv6.
Layer-3 Tunnel Traffic FLow
The traffic flow illustrated by Figure 18 and Figure 19 is as follows:
1. The frame enters the source switch (Switch-1) on VLAN 101.
The IP packet within the frame is routed through Switch-1 into the Layer-3 GRE tunnel.
2. The IP packet is encapsulated in a GRE packet.
3. The GRE packet enters the network on VLAN 10, is routed across the network to destination switch (Switch-
2), and then exits the network on VLAN 20.
The source IP address of the GRE packet is the IP address of the interface in VLAN 10 in Switch 1.
4. The IP packet is de-encapsulated and routed out of the destination switch (Switch-2) on VLAN 202.
Limitations for Static IPv6 Layer-3 Tunnels
AOS-W does not support the following functions for static IPv6 Layer-3 GREtunnels:
n IPv6 Auto-configuration and IPv6 Neighbor Discovery mechanisms do not apply to IPv6 GRE tunnels.
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