D-Link DXS-3600-EM-8T CLI Guide - Page 86
bgp fast-external-fallover, clear ip bgp
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DXS-3600 Series 10GbE Layer 2/3 Switch CLI Reference Guide 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)# 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 Parameters Default Command Mode Command Default Level Usage Guideline None. By default, this option is enabled. Router Configuration Mode. Level: 8. (EI Mode Only Command) 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)# 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 all AS-NUMBER IP-ADDRESS in (Optional) Specifies the reset of all sessions except those in the VRF address family. 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. Specifies that only the identified BGP neighbor will reset. The value for this argument is an IPv4 address. (Optional) Specifies to initiate an inbound reconfiguration. If neither the in nor the out keywords are specified, both inbound and outbound sessions will reset. 78