Specifications

BGP Features
ExtremeWare XOS 11.0 Concepts Guide 301
To view the configured values of the route flap dampening parameters for a BGP peer group, use the
following command:
show bgp peer-group {detail | <peer-group-name> {detail}}
BGP Route Selection
BGP selects routes based on the following precedence (from highest to lowest):
• higher weight
• higher local preference
• shortest length (shortest AS path)
• lowest origin code
• lowest Multi Exit Discriminator (MED)
• route from external peer
• lowest cost to next hop
• lowest routerID
Stripping Out Private AS Numbers from Route Updates
Private AS numbers are AS numbers in the range 64512 through 65534. You can remove private AS
numbers from the AS path attribute in updates that are sent to external BGP (EBGP) neighbors. Possible
reasons for using private AS numbers include:
• The remote AS does not have officially allocated AS numbers.
• You want to conserve AS numbers if you are multihomed to the local AS.
Private AS numbers should not be advertised on the Internet. Private AS numbers can be used only
locally within an administrative domain. Therefore, when routes are advertised out to the Internet, the
routes can be stripped out from the AS paths of the advertised routes using this feature.
To configure private AS numbers to be removed from updates, use the following command:
enable bgp neighbor [<remoteaddr> | all] remove-private-AS-numbers
To disable this feature, use the following command:
disable bgp neighbor [<remoteaddr> | all] remove-private-AS-numbers
Route Redistribution
BGP, OSPF, and RIP can be enabled simultaneously on the switch. Route redistribution allows the
switch to exchange routes, including static and direct routes, between any two routing protocols.
Exporting routes from OSPF to BGP and from BGP to OSPF are discrete configuration functions. To run
OSPF and BGP simultaneously, you must first configure both protocols and then verify the independent
operation of each. Then you can configure the routes to export from OSPF to BGP and the routes to
export from BGP to OSPF.