Brocade Virtual ADX Switch and Router Guide (Supporting ADX v03.1.00) - Manual (Page 258)

244 Brocade Virtual ADX Switch and Router Guide
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Changing the BGP4 next-hop update timer
8
NOTE
Generally, you should set the Hold Time to three times the value of the Keep Alive Time.
NOTE
You can override the global Keep Alive Time and Hold Time on individual neighbors. Refer to
“Configuring BGP4 neighbors” on page 228.
To change the Keep Alive Time to 30 and Hold Time to 90, enter the following command.
Virtual ADX(config-bgp)# timers keep-alive 30 hold-time 90
Syntax: [no] timers keep-alive num hold-time num
For each keyword, num indicates the number of seconds. The Keep Alive Time can be 0 – 65535.
The Hold Time can be 0 or 3 – 65535 (1 and 2 are not allowed). If you set the Hold Time to 0, the
device waits indefinitely for messages from a neighbor without concluding that the neighbor is
dead.
Changing the BGP4 next-hop update timer
By default, the device updates the BGP4 next-hop tables and affected BGP4 routes five seconds
after IGP route changes. You can change the update timer to a value from 1 – 30 seconds.
To change the BGP4 update timer value to 15 seconds, for example, enter a command such as the
following at the BGP4 configuration level of the CLI.
Virtual ADX(config-bgp)# update-time 15
Syntax: [no] update-time secs
The secs parameter specifies the number of seconds and can be from 0 – 30. The default is 5. The
value of 0 permits fast BGP4 convergence for situations such as link-failure or IGP route changes.
Setting the value to 0 starts the BGP4 route calculation in sub-second time. All other values from 1
to 30 are still calculated in seconds
Changing the device ID
The OSPF and BGP4 protocols use device IDs to identify devices that are running the protocols. A
device ID is a valid, unique IP address and sometimes is an IP address configured on the device.
The device ID cannot be an IP address in use by another device.
By default, the device ID on a device is one of the following:
• If the device has loopback interfaces, the default device ID is the IP address on the lowest
numbered loopback interface configured on the device. For example, if you configure loopback
interfaces 1, 2, and 3 as follows, the default device ID is 10.9.9.9/24:
- Loopback interface 1, 10.9.9.9/24
- Loopback interface 2, 10.4.4.4/24
- Loopback interface 3, 10.1.1.1/24
• If the device does not have any loopback interfaces, the default device ID is the lowest
numbered IP interface address configured on the device.