Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 306)

288 Brocade ICX 6650 Layer 3 Routing Configuration Guide
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BGP4 parameters
Brocade> enable
Brocade#configure terminal
Brocade(config)#router bgp
BGP4: Please configure 'local-as' parameter in order to enable BGP4.
Brocade(config-bgp-router)#local-as 10
Brocade(config-bgp-router)#neighbor 192.168.23.99 remote-as 100
Brocade(config-bgp-router)#write memory
NOTE
When BGP4 is enabled on a Brocade Layer 3 switch, 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 Layer 3 switch removes all the running configuration information for the
disabled protocol from the running-config. To restore the BGP4 configuration, you must reload the
software to load the configuration from the startup-config. Moreover, when you save the
configuration to the startup-config file after disabling the protocol, all the configuration information
for the disabled protocol is removed from the startup-config file.
The CLI displays a warning message such as the following.
Brocade(config-bgp-router)#no router bgp
router bgp mode now disabled. All bgp config data will be lost when writing to
flash!
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-config file containing the protocol 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-config file onto the flash memory.
NOTE
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.
BGP4 parameters
You can modify or set the following BGP4 parameters:
• Optional – Define the router ID. (The same router ID also is used by OSPF.)
• Required – Specify the local AS number.
• Optional – Add a loopback interface for use with neighbors.
• Required – Identify BGP4 neighbors.
• Optional – Change the Keep Alive Time and Hold Time.
• Optional – Change the update timer for route changes.
• Optional – Enable fast external fallover.