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Supported Routing Policy Features
The JUNOS software provides a routing policy language
that enables you to control the transfer of routing information between
the routing protocols and the routing tables, and between the routing
tables and the forwarding table.
You can configure policies that examine characteristics
of incoming and outgoing routes, including the following:
- Address family
- Aggregate route contributors
- BGP AS path, AS path group, community, and origin attributes
- Destination prefix
- IP address or list of addresses
- IS-IS level
- Metric
- Multicast source address
- Neighbor (peer)
- Next-hop address
- OSPF area identifier
- OSPF external route and tags
- Preference
- Protocol from which route was learned
- Router interface
- Routing instance
- Routing table
You can configure policies to perform certain actions
when routes match specified characteristics, including the following
actions:
- Accept the routes
- Add, delete, or set the BGP community
- Add or delete a BGP local preference
- Apply BGP route-damping parameters
- Apply CoS parameters
- Choose a next hop to install into the forwarding table
- Create a forwarding class
- Evaluate the next term in the policy
- Evaluate the next policy in a policy chain
- Extract the last AS number from an AS path
- Maintain packet counts based on source and destination
address
- Modify the metric value
- Modify the preference value
- Perform per-packet load balancing
- Prepend an AS path
- Reject the routes
- Set the BGP MED and origin attribute
- Set the external metric type
- Set the next hop
- Specify or modify OSPF tags
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