Administrator Guide

Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
7.8.1.0 Introduced on the S-Series.
7.7.1.0 Introduced on the C-Series. Added support for the 4-byte format.
Usage Information
All the routers in the Confederation must be 4 byte or 2 byte identified routers. You cannot mix them.
The autonomous systems configured in this command are visible to the EBGP neighbors. Each autonomous
system is fully meshed and contains a few connections to other autonomous systems.
After specifying autonomous systems numbers for the BGP confederation, recycle the peers to update their
configuration.
This command automatically restarts the BGP instance for the configuration to take effect.
Related
Commands
bgp confederation identifier — configures a confederation ID.
bgp four-octet-as-support — enables 4-byte support for the BGP process.
bgp dampening
Enable BGP route dampening and configure the dampening parameters.
C9000 Series
Syntax
bgp dampening [half-life reuse suppress max-suppress-time] [route-map map-name]
To disable route dampening, use the no bgp dampening [half-life reuse suppress max-
suppress-time] [route-map map-name] command.
Parameters
half-life (OPTIONAL) Enter the number of minutes after which the Penalty is decreased. After the
router assigns a Penalty of 1024 to a route, the Penalty is decreased by half after the half-
life period expires. The range is from 1 to 45. The default is 15 minutes.
reuse (OPTIONAL) Enter a number as the reuse value, which is compared to the flapping
route’s Penalty value. If the Penalty value is less than the reuse value, the flapping route is
once again advertised (or no longer suppressed). The range is from 1 to 20000. The
default is 750.
suppress (OPTIONAL) Enter a number as the suppress value, which is compared to the flapping
route’s Penalty value. If the Penalty value is greater than the suppress value, the flapping
route is no longer advertised (that is, it is suppressed). The range is from 1 to 20000. The
default is 2000.
max-suppress-
time
(OPTIONAL) Enter the maximum number of minutes a route can be suppressed. The
default is four times the half-life value. The range is from 1 to 255. The default is 60
minutes.
route-map map-
name
(OPTIONAL) Enter the keyword route-map then the name of a configured route map.
Only match commands in the configured route map are supported.
Defaults Disabled.
Command Modes
• ROUTER BGP
• ROUTER BGP-address-family
Border Gateway Protocol 317