Deployment Guide

Border Gateway Protocol IPv4 (BGPv4) | 335
Parameters
Defaults
Not configured.
Command Modes
ROUTER BGP
Usage
Information
You must configure your system to accept 4-Byte formats before entering a 4-Byte AS Number. All the
routers in the Confederation must be 4 or 2-Byte identified routers. You cannot mix them.
The autonomous systems configured in this command are visible to the EBGP neighbors. Each
autonomous system is fully meshed and contains a few connections to other autonomous systems. The
next hop, MED, and local preference information is preserved throughout the confederation.
FTOS accepts confederation EBGP peers without a LOCAL_PREF attribute. The software sends
AS_CONFED_SET and accepts AS_CONFED_SET and AS_CONF_SEQ.
(C-Series only) If a local-as is configured, BGP does not allow for the configuration of BGP
confederation. Similarly, if BGP confederation is configured, then BGP does not allow the
configuration of local-as.
(C-Series only) If the neighbor is an eBGP neighbor, then BGP performs a check on the first AS
number. In this scenario, it is mandatory that the first sequence in the AS path is of type
AS_SEQUENCE or AS_CONFED_SEQUENCE (in the case of confederations). If the first entry
appears as an AS_CONFED_SET and the neighbor is not in the local AS, then this is strictly a problem
with the neighbor node.
This command automatically restarts the BGP instance for the configuration to take effect.
Related
Commands
Command
History
bgp connection-retry-timer
c
Configures the BGP connection retry timer.
Syntax
bgp connection-retry-timer retry-timer-value
To return to the default configuration, enter the no connection-retry-timer retry-timer-value
command.
Parameters
Defaults
60 Seconds.
as-number
Enter the AS number.
Range: 0-65535 (2-Byte)
or
1-4294967295 (4-Byte)
or
0.1-65535.65535 (Dotted format)
bgp four-octet-as-support Enable 4-Byte support for the BGP process.
Version 7.8.1.0 Introduced support on S-Series
Version 7.7.1.0 Introduced support on C-Series
Added support for 4-Byte format
retry-timer-val
ue
Enter a value that denotes the time interval after which the session retries the connection.
The valid range is from 10 to 65535.