Compatible Systems 5.4 - Manual (Page 270)

264 Chapter 16 - BGP
For multi-homed installation where more than one ISP is used, an “official”
AS number is required.
BGP Local Preference
The local preference number sets the local preference of this router. The local
preference is exchanged among routers in the same AS and is an indication
about which path is preferred to exit the AS. A path with a higher local pref-
erence is more preferred.
Use IPR Filters
This checkbox sets whether the router will use IP route filters instead of BGP
route maps. BGP uses BGP route maps to filter routes and set attributes. If no
BGP route maps have been configured, the router will automatically use any
configured IP route filters. IP Route Filters are set in Chapter 11 - TCP/IP
Filtering.
BGP Aggregates Dialog Box
This dialog box defines a list of networks which are to be aggregated before
being advertised to external peers. The router’s IP routing table must contain
the networks which are a subset of the aggregate in order for the aggregate to
be advertised.
v Note: Only the aggregate, and not the individual routes, will be advertised
to external peers. Internal peers will receive the individual routes if they orig-
inated outside the Autonomous System. Internal peers do not exchange
internal routes via BGP.
BGP Aggregates Dialog Box
To access this dialog box, select BGP/BGP Aggregates from the device view.