Compatible Systems 5.4 Manuale Utente

For multi-homed installation where more than one ISP is used, an “official” 
AS number is required.

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.

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.

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.