Reference Guide

Usage
Information
The bgp fast-external-failover command appears in the show config
command output.
bgp four-octet-as-support
Enable 4-byte support for the BGP process.
Syntax
bgp four-octet-as-support
To disable fast external fallover, use the no bgp four-octet-as-support
command.
Defaults Disabled (supports 2-Byte format)
Command
Modes
ROUTER BGP
Command
History
This guide is platform-specific. For command information about other platforms,
refer to the relevant Dell Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version
8.3.19.0
Introduced on the S4820T.
Version 8.4.2.1 Introduced on the C-Series and S4810.
Version 8.2.1.0 Introduced on the E-Series ExaScale.
Version 7.4.1.0 Introduced on the E-Series TeraScale.
Usage
Information
Routers supporting 4-Byte ASNs advertise that function in the OPEN message. The
behavior of a 4-Byte router is slightly different depending on whether it is speaking
to a 2-Byte router or a 4-Byte router.
When creating Confederations, all the routers in the Confederation must be 4- or
2-byte identified routers. You cannot mix them.
Where the 2-Byte format is from 1 to 65535, the 4-Byte format is from 1 to
4294967295. Both formats are accepted, and the advertisements reflect the
entered format.
For more information about using the 2- or 4-Byte format, refer to the Dell
Networking OS Configuration Guide.
1076
IPv6 Border Gateway Protocol (IPv6 BGP)