Redistributing Routes To Bgp - Nokia IPSO 4.0 Reference Manual

Refines—Matches a route only if it is more specific than the given prefix.
Range—Matches any route whose IP address equals the given prefix's IP address and
whose mask length falls within the specified mask length range.
A sample route redistribution examples follow.
Note
The Route Redistribution link contains over thirty possible route redistribution options.
The redistribute_list specifies the source of a set of routes based on parameters such as the
protocol from which the source has been learned. The redistribute_list indirectly controls the
redistribution of routes between protocols.
The syntax varies slightly per source protocol. BGP routes may be specified by source AS. RIP
and IGRP routes may be redistributed by protocol, source interface, and/or source gateway. Both
OSPF and OSPF ASE routes may be redistributed into other protocols. All routes may be
redistributed by AS path.
When BGP is configured, all routes are assigned an AS path when they are added to the routing
table. For all interior routes, this AS path specifies IGP as the origin and no ASes in the AS path.
The current AS is added when the route is redistributed. For BGP routes, the AS path is stored as
learned from BGP.

Redistributing Routes to BGP

Redistributing to BGP is controlled by an AS. The same policy is applied to all firewalls in the
AS. BGP metrics are 16-bit, unsigned quantities; that is, they range from 0 to 65535 inclusive,
with zero being the most attractive. While BGP version 4 supports 32-bit unsigned quantities,
IPSRD does not.
Note
If you do not specify a redistribution policy, only routes to attached interfaces are
redistributed. If you specify any policy, the defaults are overridden. You must explicitly
specify everything that should be redistributed.
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