Dell Force10 S25N-S50N FTOS Command Line Reference Guide FTOS 8.4.2.7 E-Series - Page 743

Command Modes ROUTER BGP Usage Information This is enabled by default, that is for all updates received from EBGP peers, BGP ensures that the first AS of the first AS segment is always the AS of the peer. If not, the update is dropped and a counter is incremented. Use the show ip bgp ipv6 unicast neighbors command to view the "failed enforce-first-as check counter. If enforce-first-as is disabled, it can be viewed via the show ip protocols command. Related Commands show ip bgp ipv6 unicast neighbors show ip protocols Display IPv6 routing information exchanged by BGP neighbors. View Information on routing protocols. Command History Version 8.4.2.1 Version 8.2.1.0 Version 7.4.1.0 Introduced on C-Series and S4810. Introduced on E-Series ExaScale Introduced on E-Series TeraScale bgp fast-external-fallover c e Enable the fast external fallover feature, which immediately resets the BGP session if a link to a directly connected external peer fails. Syntax bgp fast-external-fallover To disable fast external fallover, enter no bgp fast-external-fallover. Defaults Enabled Command Modes ROUTER BGP Command History Version 8.4.2.1 Version 8.2.1.0 Version 7.4.1.0 Introduced on C-Series and S4810. Introduced on E-Series ExaScale Introduced on E-Series TeraScale Usage The bgp fast-external-fallover command appears in the show config command output. Information bgp four-octet-as-support c e Enable 4-byte support for the BGP process Syntax bgp four-octet-as-support To disable fast external fallover, enter no bgp four-octet-as-support. Defaults Disabled (supports 2-Byte format) Command Modes ROUTER BGP IPv6 Border Gateway Protocol (IPv6 BGP) | 743