Brocade BigIron RX Series Configuration Guide - Manual (Page 904)

826 BigIron RX Series Configuration Guide
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Entering and exiting the address family configuration level
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BigIron RX> enable
BigIron RX# configure terminal
BigIron RX(config)# router bgp
BGP4: Please configure 'local-as' parameter in order to enable BGP4.
BigIron RX(config-bgp)# local-as 10
BigIron RX(config-bgp)# write memory
The router bgp command enables the BGP4 protocol.
(For information on the local AS number, refer to “Setting the local AS number” on page 845.)
NOTE
By default, the Brocade router ID is the IP address configured on the lowest numbered loopback
interface. If the device does not have a loopback interface, the default router ID is the lowest
numbered IP interface address configured on the device. For more information, refer to
“Changing
the router ID” on page 865. If you change the router ID, all current BGP4 sessions are cleared.
NOTE
When BGP4 is enabled on a BigIron RX, you do not need to reset the system. The protocol is
activated as soon as you enable it. Moreover, the router begins a BGP4 session with a BGP4
neighbor as soon as you add the neighbor.
Note regarding disabling BGP4
If you disable BGP4, the BigIron RX removes all the running configuration information for the
disabled protocol from the running configuration. To restore the BGP4 configuration, you must
reload the software to load the configuration from the startup configuration. Moreover, when you
save the configuration to the startup configuration file after disabling the protocol, all the
configuration information for the disabled protocol is removed from the startup configuration file.
The CLI displays a warning message such as the following.
BigIron RX(config)# no router bgp
router bgp mode now disabled. All bgp config data will be lost when writing to
flash!
The Web management interface does not display a warning message.
If you are testing a BGP4 configuration and are likely to disable and re-enable the protocol, you
might want to make a backup copy of the startup configuration file containing the protocol’s
configuration information. This way, if you remove the configuration information by saving the
configuration after disabling the protocol, you can restore the configuration by copying the backup
copy of the startup configuration file onto the flash memory.
To disable BGP4 without losing the BGP4 configuration information, remove the local AS (for
example, by entering the no local-as <num> command). In this case, BGP4 retains the other
configuration information but is not operational until you set the local AS again.
Entering and exiting the address family configuration level
The BGP address family has a unicast or multicast sub-level.
To enter the IPv4 BGP unicast address family configuration level, enter the following command.