Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 323)

Brocade ICX 6650 Layer 3 Routing Configuration Guide 305
53-1002603-01
Optional BGP4 configuration tasks
This command changes the update timer to 15 seconds.
Syntax: [no] update-time secs
The secs parameter specifies the number of seconds and can be from 1 through 30. The default is
5.
Enabling fast external fallover
BGP4 routers rely on KEEPALIVE and UPDATE messages from neighbors to signify that the
neighbors are alive. For BGP4 neighbors that are two or more hops away, such messages are the
only indication that the BGP4 protocol has concerning the alive state of the neighbors. As a result,
if a neighbor dies, the router will wait until the Hold Time expires before concluding that the
neighbor is dead and closing its BGP4 session and TCP connection with the neighbor.
The router waits for the Hold Time to expire before ending the connection to a directly-attached
BGP4 neighbor that dies.
For directly attached neighbors, the router immediately senses loss of a connection to the neighbor
from a change of state of the port or interface that connects the router to its neighbor. For directly
attached EBGP neighbors, the router can use this information to immediately close the BGP4
session and TCP connection to locally attached neighbors that die.
NOTE
The fast external fallover feature applies only to directly attached EBGP neighbors. The feature does
not apply to IBGP neighbors.
If you want to enable the router to immediately close the BGP4 session and TCP connection to
locally attached neighbors that die, use either of the following methods.
To enable fast external fallover, enter the following command.
Brocade(config-bgp-router)#fast-external-fallover
To disable fast external fallover again, enter the following command.
Brocade(config-bgp-router)#no fast-external-fallover
Syntax: [no] fast-external-fallover
Changing the maximum number of paths for
BGP4 load sharing
Load sharing enables the Layer 3 switch to balance traffic to a route across multiple equal-cost
paths of the same type (EBGP or IBGP) for the route.
To configure the Layer 3 switch to perform BGP4 load sharing:
• Enable IP load sharing if it is disabled.
• Set the maximum number of paths. The default maximum number of BGP4 load sharing paths
is 1, which means no BGP4 load sharing takes place by default.
NOTE
The maximum number of BGP4 load sharing paths cannot be greater than the maximum
number of IP load sharing paths.