3. Enter the rib-route-limit command to set the maximum number of BGP4 rib routes that can be installed in the RTM.
device(config-bgp)# rib-route-limit 500
Syntax: rib-route-limit decimal
The decimal variable species the maximum number of BGP4 rib routes that can be installed in the RTM. The user may enter
any number for the decimal variable for the rib-route-limit command. By default, there is no limit. If the rib-route-limit
command is set to 0, no BGP4 routes are installed in the RTM. If a BGP4 route is not installed in the RTM because of the
conguration set by the rib-route-limit command, the always-propagate command must be enabled for preferred BGP4
routes to be advertised to the BGP4 neighbors.
If the rib-route-limit command is congured to a value that is below the number of BGP4 routes already installed in the RTM,
the following warning message is displayed on the console.
device(config-bgp)# rib-route-limit 250
The new limit is below the current bgp rib route count. Please use Clear ip bgp routes command to
remove bgp rib routes.
You can only use one of the following commands to clear all BGP4 routes in the RTM, and reset the routes for preferred BGP4
routes to be reinstalled in the RTM. Depending on the type of route the rib-route-limit command is used for, select from one of
the following commands:
• clear ip bgp routes command. This command is used to clear IPv4 BGP unicast routes.
• clear ipv6 bgp routes command. This command is used to clear IPv6 BGP unicast routes.
NOTE
It is not guaranteed that the same number of preferred BGP4 routes will be reinstalled in the RTM.
4. Perform the following step to:
• exit the BGP4 unicast family conguration.
device(config-bgp-ipv4u)# exit-address-family
Syntax: exit-address-family
When you enter the exit-address-family command at the address family conguration level, you return to the BGP4 unicast
address family conguration level (the default BGP4 level).
Displaying conguration for BGP route reector
To display the conguration for preferred BGP4 routes not installed in the RTM, use the show ip bgp route command as shown in the
following example.
device(config-bgp)# show ip bgp route
Total number of BGP Routes: 333422
Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED
E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH m:NOT-INSTALLED-MULTIPATH
S:SUPPRESSED F:FILTERED s:STALE
Prefix Next Hop MED LocPrf Weight Status
...5 10.12.0.0/24 10.100.100.4 100 0 E
AS_PATH:48 1994 65148 21948 6461 1239 4837 4808 17431 18245...
Syntax: show ip bgp route
In the previous output, BGP4 receives 333,422 routes and the rib-route-limit command is
congured to 300,000 routes. The always-
propagate command has not been enabled. However, because the rib-route-limit command is congured to allow for 300,000 routes
in the RTM, BGP4 installs only 300,000 routes of the 333,422 routes received in the RTM. When the always-propagate command is
enabled, a preferred BGP4 route not installed in the RTM is now considered as the best BGP4 route to be advertised to other peers. The
route is identied by the letter "b" (for NOT-INSTALLED-BEST) in the Status eld. However, when the always-propagate command is
BGP route reector
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