
IP Concepts, Terminology, and Features
117356-E Rev 00
1-23
The flow of routing information between the network, the protocols, and the
routing table manager is controlled by routing information policies.
Each time that a routing update arrives from a remote router, the following steps
occur (see Figure 1-7
):
1. The protocol receiving the route consults an accept policy to determine
whether to forward the route to the IP routing table manager or drop the route.
2. If the protocol forwards the route, the routing table manager determines
whether to inject the route into the routing table.
Figure 1-7. Accept and Announce Policies
Accept
policy
Announce
policy
Routing
table
manager
Routing
table
IP0036A
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