Dell BigIron RX Series, Configuration Manual

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BigIron RX Series Configuration Guide 775
53-1002253-01
Configuring BGP4 neighbors
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timers keep-alive <num> hold-time <num> overrides the global settings for the Keep Alive Time
and Hold Time. For the Keep Alive Time, you can specify from 0 – 65535 seconds. For the Hold
Time, you can specify 0 or
3 – 65535 (1 and 2 are not allowed). If you set the Hold Time to 0, the router waits indefinitely for
messages from a neighbor without concluding that the neighbor is dead. The defaults for these
parameters are the currently configured global Keep Alive Time and Hold Time. For more
information about these parameters, refer to
“Changing the keep alive time and hold time” on
page 789.
unsuppress-map <map-name> removes route suppression from a neighbor’s routes when those
routes have been suppressed due to aggregation. Refer to “Removing route dampening from
suppressed neighbor routes” on page 775.
update-source <ip-addr> | ethernet <slot>/<portnum> | loopback <num> | ve <num> configures
the router to communicate with the neighbor through the specified interface. There is no default.
weight <num> specifies a weight the device will add to routes received from the specified neighbor.
BGP4 prefers larger weights over smaller weights. The default weight is 0.
Removing route dampening from suppressed
neighbor routes
You can selectively unsuppress more-specific routes that have been suppressed due to
aggregation, and allow the routes to be advertised to a specific neighbor or peer group.
Here is an example.
In the example above, the aggregate-address command configures an aggregate address of
209.1.0.0 255.255.0.0. and the summary-only parameter prevents the device from advertising
more specific routes contained within the aggregate route.
Entering a show ip bgp route command for the aggregate address 209.1.0.0/16 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. If you enter the command below, the display shows that
the route is not being advertised to the device’s BGP4 neighbors.
BigIron RX(config-bgp)# aggregate-address 209.1.0.0 255.255.0.0 summary-only
BigIron RX(config-bgp)# 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
AS_PATH:
BigIron RX(config-bgp)# 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