You can think of routing policy as a way to control the flow of routes into and out of
the router.
The decision about which routes to accept from and advertise to various neighbors
has an important impact on the traffic that crosses a network. Routing policy is used
to enforce business agreements between two or more Internet service providers
(ISPs) concerning the amount and type of traffic that is allowed to pass between
them.
You can use one or more of the following mechanisms to configure routing policy:
■
“Route Maps” on page 4
■
“Match Policy Lists” on page 20
■
“Access Lists” on page 21
■
“Prefix Lists” on page 33
■
“Prefix Trees” on page 36
■
“Community Lists” on page 38
Platform Considerations
Configuring routing policies is supported on all E Series routers.
For information about the modules supported on E Series routers:
■
See the
ERX Module Guide
for modules supported on ERX7xx models, ERX14xx
models, and the Juniper Networks ERX310 Broadband Services Router.
■
See the
E120 and E320 Module Guide
for modules supported on the Juniper
Networks E120 and E320 Broadband Services Routers.
References
For more information about the protocols discussed in this chapter, see their
respective chapters in this guide and other guides within the JUNOSe documentation
set, and to the References sections within those chapters.
Route Maps
You can use route maps to control and modify routing information and to define
conditions for redistributing routes between routing domains. You can apply route
maps to inbound, outbound, or redistribution routes. A route map consists of
match
clauses and
set
clauses.
Match clauses specify the attribute values that determine whether a route matches
the route map. A route that has the same attribute values passes the match condition.
Routes that pass all the match conditions match the route map. You issue
match
commands to define the match conditions for a route map. You can specify the
match conditions in any order. If you do not specify
any
match conditions in a route
map, that route map matches
all
routes.
4
■
Platform Considerations
JUNOSe 11.0.x IP Services Configuration Guide
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