Brocade Communications Systems FastIron SX 1600 Configuration Manual Download

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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 specifies 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
configuration 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 configured 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 configuration.

device(config-bgp-ipv4u)# exit-address-family

Syntax:

exit-address-family

When you enter the

exit-address-family

command at the address family configuration level, you return to the BGP4 unicast

address family configuration level (the default BGP4 level).

Displaying configuration for BGP route reflector

To display the configuration 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

bgp

route

In the previous output, BGP4 receives 333,422 routes and the

rib-route-limit

command is configured to 300,000 routes. The

always-

propagate

command has not been enabled. However, because the

rib-route-limit

command is configured 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 identified by the letter "b" (for NOT-INSTALLED-BEST) in the Status field. However, when the

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