Chapter 50
| IP Routing Commands
Border Gateway Protocol (BGPv4)
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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
Command Usage
â—† This command immediately resets the connection for directly adjacent external
peers if the interface goes down for any reason other than TCP timeout.
â—† If fast external failover is disabled, the routing process waits until the default
hold timer expires to reset the session.
Example
Console(config-router)#bgp fast-external-failover
Console(config-router)#
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