I need to be able to implement policy routing on traffic as it exits a GRE tunnel interface. However, policy routing is applied as traffic enters the interface, I need to know when the policy routing is tested and how it is applied.
The possibilities I can imagine are:
1. The policy is applied while the packet is still GRE encapsulated, and the routes are applied based on the GRE addresses, which are stripped off and discarded.
2. The policy is applied while the packet is still GRE encapsulated, and the routes are applied based on the GRE addresses, but the policy gets applied to the internal packet after the GRE header is removed.
3. The GRE header is removed and then the policy is applied.
Policy-based routing provides a tool for forwarding and routing data packets based on policies. In effect, it is a way to have the policy override routing protocol decisions. Policy-based routing includes a mechanism for selectively applying policies based on access list, packet size or other criteria. The actions taken can include routing packets on user-defined routes, setting the precedence, type of service bits, etc.
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