Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

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bgp four-octet-as-support

Enable 4-byte support for the BGP process.

Syntax

bgp four-octet-as-support

To disable fast external failover, use the no bgp four-octet-as-support command.

Defaults

Disabled (supports 2–byte format)

Command Modes

ROUTER BGP

Supported Modes

Full–Switch

Command History

Version	Description
9.9(0.0)	Introduced on the FN IOM.
9.2(0.0)	Introduced on the MXL 10/40GbE Switch IO Module.

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 byte 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 byte or 4-byte format, refer to the Dell Networking OS Configuration Guide .