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DXS-3600 Series 10GbE Layer 2/3 Switch CLI Reference Guide
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7-21 bgp fast-external-fallover
This command is used to configure the Border Gateway Protocol (BGP) routing process to immediately reset external
BGP peering sessions if the link used to reach these peers goes down. To disable the BGP fast external fallover option,
use the no form of this command.
bgp fast-external-fallover
no bgp fast-external-fallover
7-22 clear ip bgp
This command is used to reset Border Gateway Protocol (BGP) connections using a hard or soft reconfiguration.
clear ip bgp {all | AS-NUMBER | IP-ADDRESS} [soft [{in [prefix-filter] | out}]]
Parameters
Example
This example shows how to enable the security of the BGP network for the
autonomous system 65534. All incoming updates from eBGP peers are examined to
ensure that the first AS number in the AS-PATH attribute is the local AS number of
the transmitting peer.
DXS-3600-32S#configure terminal
DXS-3600-32S(config)#router bgp 65534
DXS-3600-32S(config-router)#bgp enforce-first-as
DXS-3600-32S(config-router)#
Parameters
None.
Default
By default, this option is enabled.
Command Mode
Router Configuration Mode.
Command Default Level
Level: 8. (EI Mode Only Command)
Usage Guideline
This command is used to disable or enable the fast external fallover for BGP peering
sessions with directly connected external peers. The session will immediately reset if
a link goes down. Only directly connected peering sessions are supported.
If the BGP fast external fallover is disabled, the BGP routing process will wait until
the default hold timer expires (3 keepalives) to reset the peering session.
You can verify your settings by entering the show ip bgp parameters command.
Example
In the following example, the BGP fast external fallover feature is disabled. If the link
through which this session is carried flaps, then the connection will not reset.
DXS-3600-32S#configure terminal
DXS-3600-32S(config)#router bgp 65534
DXS-3600-32S(config-router)#no bgp fast-external-fallover
DXS-3600-32S(config-router)#
all (Optional) Specifies the reset of all sessions except those in the VRF address family.
AS-NUMBER Specifies that sessions, with BGP peers, in the specified autonomous system the will
be reset. The range for 2-byte numbers is from 1 to 65535. The range for 4-byte
numbers is from 1 to 4294967295.
IP-ADDRESS Specifies that only the identified BGP neighbor will reset. The value for this argument
is an IPv4 address.
in (Optional) Specifies to initiate an inbound reconfiguration. If neither the in nor the out
keywords are specified, both inbound and outbound sessions will reset.
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