update-time (BGP)

Configures the interval at which BGP next-hop tables are modified. BGP next-hop tables should always have IGP (non-BGP) routes.
Syntax
update-time sec
no update-time sec
Parameters
sec
Update time in seconds. Valid values range from 0 through 30. Default is 5 seconds.
Modes

BGP configuration mode

BGP address-family IPv6 unicast configuration mode

Usage Guidelines

When this command is entered in BGP global configuration mode, it applies only to the IPv4 address family. Use this command in BGP address-family IPv6 unicast configuration mode for BGP4+ configurations.

The update time determines how often the device computes the routes (next-hops). Lowering the value set by the update-time command increases the convergence rate.

By default, the device updates the BGP next-hop tables and affected BGP routes five seconds following IGP route changes. Setting the update time value to 0 permits fast BGP convergence for situations such as a link failure or IGP route changes, starting the BGP route calculation in sub-second time.

Note: Use the advertisement-interval command to determine how often to advertise IGP routes to the BGP neighbor.
Examples

The following example permits fast convergence for the IPv4 unicast address family. 

device# configure terminal
device(config)# router bgp
device(config-bgp-router)# update-time 0

The following example sets the update time interval to 30 the IPv6 unicast address family. 

device# configure terminal
device(config)# router bgp
device(config-bgp-router)# address-family ipv6 unicast
device(config-bgp-ipv6u)# update-time 30
Parent topic: Commands Si - Z