D-Link DXS-3600 Series Cli Reference Manual page 169

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch CLI Reference Guide
Use this command to enforce that the routes received from an eBGP peer must have the peer's AS
number as the first AS in the AS path. This feature is used to avoid the local router from spoofing by a
misconfigured peer.
Example
This example shows how to enable the security of the BGP network for autonomous system 65534. All
incoming updates from eBGP peers are examined to ensure that the first AS number in the AS-path is the
local AS number of the transmitting peer:
Switch# configure terminal
Switch(config)# router bgp 65534
Switch(config-router)# bgp enforce-first-as
11-20 bgp fast-external-failover
This command is used to immediately reset an external BGP peering session if the link directly connected
to the peer goes down. Use the no form of the command to disable BGP fast external failover.
bgp fast-external-failover
no bgp fast-external-failover
Parameters
None.
Default
By default, this option is enabled.
Command Mode
Router Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
This command is used to globally disable or enable fast external failover of BGP sessions for the directly
connected external peers. When fast-external-failover is enabled, the session is immediately reset if the
link goes down. When fast external failover is disabled, the session will not be reset until the default hold
timer expires (3 keep alive times).
Example
This example shows how to configure the BGP fast external failover feature as disabled. If the link
through which the session is carried flaps, the session will not be reset.
Switch# configure terminal
Switch(config)# router bgp 65534
Switch(config-router)# no bgp fast-external-failover
11-21 bgp graceful-restart
This command is used to enable the BGP graceful restart capabilities for all BGP neighbors. Use the no
form of this command to restore the router to its default state.
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