Policy Framework Configuration Guide - Juniper Networks

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Junos 10.4 Policy Framework Configuration Guide words, an export policy does not evaluate all routes; it evaluates only those routes that a routing protocol is allowed to advertise to a neighbor. For more information about the active path selection algorithm, see the Junos OS Routing Protocols Configuration Guide. NOTE: By default, BGP advertises active routes. However, you can configure BGP to advertise inactive routes, which go to the same destination as other routes but have less preferable metrics. For more information about advertising inactive routes, see the Junos OS Routing Protocols Configuration Guide. “Protocols That Can Be Imported to and Exported from the Routing Table” on page 18 lists the routing protocols from which the routing table can import routes and to which the routing table can export routes. That topic also lists direct and explicitly configured routes, which for the purposes of this table are considered a pseudoprotocol. (An explicitly configured route is a route that you have configured. Direct routes are not explicitly configured; they are created as a result of IP addresses being configured on an interface.) Explicitly configured routes include aggregate, generated, local, and static routes. (An aggregate route is a route that distills groups of routes with common addresses into one route. A generated route is a route used when the routing table has no information about how to reach a particular destination. A local route is an IP address assigned to a router interface. A static route is an unchanging route to a destination.) The policy framework software treats direct and explicitly configured routes as if they are learned through routing protocols; therefore, they can be imported into the routing table. Routes cannot be exported from the routing table to the pseudoprotocol, because this protocol is not a real routing protocol. However, aggregate, direct, generated, and static routes can be exported from the routing table to routing protocols, whereas local routes cannot. For information about the default routing policies for each routing protocol, see “Default Import and Export Policies for Protocols” on page 21. For information about the import and export routing policies supported for each routing protocol and the level at which you can apply these policies, see “Protocols That Can Be Imported to and Exported from the Routing Table” on page 18. Protocols That Can Be Imported to and Exported from the Routing Table Table 5: Protocols That Can Be Imported to and Exported from the Routing Table Protocol Import Export BGP Yes Yes Distance Vector Multicast Routing Protocol (DVMRP) Yes Yes IS-IS Yes Yes LDP Yes Yes 18 Copyright © 2010, Juniper Networks, Inc.
Chapter 2: Introduction to Routing Policy Table 5: Protocols That Can Be Imported to and Exported from the Routing Table (continued) Protocol Import Export MPLS Yes No OSPF Yes Yes Protocol Independent Multicast (PIM) dense mode Yes Yes PIM sparse mode Yes Yes PIM sparse-dense mode Yes Yes Pseudoprotocol: Yes No • Direct routes • Explicitly configured routes • Aggregate routes • Generated routes • Local routes • Static routes Routing Information Protocol (RIP) and Routing Information Protocol next generation (RIPng) Yes Yes Routing Tables Affected by Routing Policies Table 6 on page 19 lists the routing tables affected by default and user-defined routing policies and the types of routes that each routing table stores. Table 6: Routing Tables Affected by Routing Policies Routing Table Type of Routes Stored inet.0 Unicast IPv4 routes .inet.0 instance-name Unicast IPv4 routes for a particular routing instance inet.1 Multicast IPv4 routes inet.2 Unicast IPv4 routes for multicast reverse-path forwarding (RPF) lookup inet.3 MPLS routes mpls.0 MPLS routes for label-switched path (LSP) next hops inet6.0 Unicast IP version 6 (IPv6) routes Copyright © 2010, Juniper Networks, Inc. 19
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CHAPTER 7 Summary of Routing Policy
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CHAPTER 10 Introduction to Traffic
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CHAPTER 11 Policer Configuration Si
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PART 5 Indexes • Index on page 46
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Index of Statements and Commands A
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Index of Statements and Commands si
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