Foundry Configuration Guide for the FESX, FSX, and FWSX
21 - 62 © Foundry Networks, Inc. December 2005
Here is an example.
The aggregate-address command configures an aggregate address. The summary-only parameter prevents
the Layer 3 Switch from advertising more specific routes contained within the aggregate route. The show ip bgp
route command shows that the more specific routes aggregated into 209.1.0.0/16 have been suppressed. In this
case, the route to 209.1.44.0/24 has been suppressed. The following command indicates that the route is not
being advertised to the Layer 3 Switch’s BGP4 neighbors.
If you want to override the summary-only parameter and allow a specific route to be advertised to a neighbor,
enter commands such as the following:
The ip prefix-list command configures an IP prefix list for network 209.1.44.0/24, which is the route you want to
unsuppress. The next two commands configure a route map that uses the prefix list as input. The neighbor
command enables the Layer 3 Switch to advertise the routes specified in the route map to neighbor 10.1.0.2. The
clear command performs a soft reset of the session with the neighbor so that the Layer 3 Switch can advertise the
unsuppressed route.
Syntax: [no] neighbor <ip-addr> | <peer-group-name> unsuppress-map <map-name>
FESX424 Router(config-bgp-router)# aggregate-address 209.1.0.0 255.255.0.0
summary-only
FESX424 Router(config-bgp-router)# show ip bgp route 209.1.0.0/16 longer
Number of BGP Routes matching display condition : 2
Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED
E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH S:SUPPRESSED F:FILTERED
Prefix Next Hop Metric LocPrf Weight Status
1 209.1.0.0/16 0.0.0.0 101 32768 BAL
AS_PATH:
2 209.1.44.0/24 10.2.0.1 1 101 32768 BLS
FESX424 Router(config-bgp-router)# show ip bgp route 209.1.44.0/24
Number of BGP Routes matching display condition : 1
Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED
E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH S:SUPPRESSED F:FILTERED
Prefix Next Hop Metric LocPrf Weight Status
1 209.1.44.0/24 10.2.0.1 1 101 32768 BLS
AS_PATH:
Route is not advertised to any peers
FESX424 Router(config)# ip prefix-list Unsuppress1 permit 209.1.44.0/24
FESX424 Router(config)# route-map RouteMap1 permit 1
FESX424 Router(config-routemap RouteMap1)# match prefix-list Unsuppress1
FESX424 Router(config-routemap RouteMap1)# exit
FESX424 Router(config)# router bgp
FESX424 Router(config-bgp-router)# neighbor 10.1.0.2 unsuppress-map RouteMap1
FESX424 Router(config-bgp-router)# clear ip bgp neighbor 10.1.0.2 soft-out
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