Administrator Guide

To disable fast external failover, 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 Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
7.8.1.0 Introduced on the S-Series.
7.7.1.0 Introduced on the C-Series.
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.
bgp graceful-restart
To support graceful restart as a receiver only, enable graceful restart on a BGP neighbor, a BGP node, or designate a local router.
C9000 Series
Syntax
bgp graceful-restart [restart-time seconds] [stale-path-time seconds] [role
receiver-only]
To return to the default, use the no bgp graceful-restart command.
Parameters
restart-time
seconds
Enter the keyword restart-time then the maximum number of seconds to restart and
bring-up all the peers. The range is from 1 to 3600 seconds. The default is 120 seconds.
stale-path-time
seconds
Enter the keyword stale-path-time then the maximum number of seconds to wait
before restarting a peer’s stale paths. The default is 360 seconds.
role receiver-only Enter the keyword role receiver-only to designate the local router to support
graceful restart as a receiver only.
Defaults as above
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.
Border Gateway Protocol 321