•Assigning priority to different types of traffic
•Assigning security levels to different types of traffic The advantages of using Tunnel include:
1. It provides communication between
2. Multiple protocols types can be consolidated on a common backbone for reduced operational cost.
3. Assurance of privacy and security in shared networks that support multiple enterprise customers.
GRE is a multi protocol carrier and it encapsulates IP and other packets inside IP tunnel. In a GRE tunnel, a router at each side of the tunnel encapsulates
GRE allows a newly created tunnel to pass traffic to the other end of the tunnel. This enables the network administrator access to traffic mapped to the GRE tunnel. The switch provides a path to tunnel all WLAN traffic to the other end of the tunnel. This enables network administrators to forward MU traffic to a remote network without modifying their network configuration and thereby enabling them to span their subnet across the intermediate network. Each GRE tunnel however, must be on a unique subnet to function properly.
All data packets going from the configured WLAN to the GRE tunnel are forwarded to the mapped GRE tunnel using GRE encapsulation. The other end of the GRE tunnel is responsible for removing the GRE header and forwarding it to the destination IP.
The current implementation of GRE makes use of the management IP stack to route GRE encapsulated traffic. Encapsulation and decapsulation is done in the user space, which affects the performance of the switch. All the
GRE tunneling consists of three protocol types:
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•Carrier— GRE Protocol provides carrier services
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