ECS4660-28F_Management Guide-R03

C HAPTER 51 | IP Routing Commands
Border Gateway Protocol (BGPv4)
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Penalties are cumulative, and the penalty for the route is stored in the
BGP routing table until it exceeds the suppress limit. At that point, the
route state changes to damped.
◆ Note that route dampening only applies to external BGP routes.
EXAMPLE
Console(config-router)#bgp dampening 20 1200 20000 220
Console(config-router)#
bgp enforce-first-as This command denies an update received from an external peer that does
not list its own autonomous system number at the beginning of the AS
path attribute. Use the no form to disable this feature.
SYNTAX
[no] bgp enforce-first-as
COMMAND MODE
Router Configuration
DEFAULT SETTING
Disabled
COMMAND USAGE
This command can be used to prevent a peer from misdirecting traffic by
advertising a route as if sourced from another autonomous system.
EXAMPLE
Console(config-router)#bgp enforce-first-as
Console(config-router)#
bgp fast-external-
failover
This command resets sessions for any directly connected external peers if
the link goes down. Use the no form to disable this feature.
SYNTAX
[no] bgp fast-external-failover
COMMAND MODE
Router Configuration
DEFAULT SETTING
Enabled