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Creating Routing Policies
The following are typical circumstances under which
you might want to preempt the default routing policies in the routing
policy framework by creating your own routing policies:
- You do not want a protocol to import all routes into the
routing table. If the routing table does not learn about certain routes,
they can never be used to forward packets and they can never be redistributed
into other routing protocols.
- You do not want a routing protocol to export all the active
routes it learns.
- You want a routing protocol to announce active routes
learned from another routing protocol, which is sometimes called route redistribution.
- You want to manipulate route characteristics, such as
the preference value, AS path, or community. You can manipulate the
route characteristics to control which route is selected as the active
route to reach a destination. In general, the active route is also
advertised to a router’s neighbors.
- You want to change the default BGP route flap-damping
parameters.
- You want to perform
per-packet load balancing.
- You want to enable class of service (CoS).
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