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Table of Contents

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ADVPN and shortcut paths
ADVPN with BGP as the routing protocol
Applying BGP route-map to multiple BGP neighbors
Basic BGP example
BGP conditional advertisement
BGP error handling per RFC 7606
BGP multiple path support
BGP next hop tag-match mode
Configuring RADIUS SSO authentication
Controlling traffic with BGP route mapping and service rules
IBGP and EBGP support in VRF
IKEv2 IPsec site-to-site VPN to an AWS VPN gateway
Next hop recursive resolution using ECMP routes
Next hop recursive resolution using other BGP routes
Route filtering with a distribution list
Route leaking between VRFs with BGP
SD-WAN related diagnose commands
Using BGP tags with SD-WAN rules

Administration Guide

BGP

Border Gateway Protocol (BGP) is a standardized routing protocol that is used to route traffic across the internet. It exchanges routing information between Autonomous Systems (AS) on the internet and makes routing decisions based on path, network policies, and rule sets. BGP contains two distinct subsets: internal BGP (iBGP) and external BGP (eBGP). iBGP is intended for use within your own networks. eBGP is used to connect different networks together and is the main routing protocol for the internet backbone.

To configure BGP in the GUI, go to Network > BGP:

Option

Description

Local AS

The AS number for the local router.

Router ID

A unique ID to identify your router in the network, typically in the format x.x.x.x.

Neighbors

The neighbors that the FortiGate will be peering with. Configure the remote router's AS number, any other properties used for peering with the neighbor, and IPv4 and IPv6 filtering.

Neighbor Groups

The neighbor groups that share the same outbound policy configurations.

Neighbor Ranges

The source address range of BGP neighbors that will be automatically assigned to a neighbor group.

IPv4 & IPv6 Networks

The networks to be advertised to other BGP routers.

IPv4 & IPv6 Redistribute

Enable redistribution by protocol. Specify either All routes, or Filter by route map.

Dampening

Enable route flap dampening to reduce the propagation of flapping routes.

Graceful Restart

Enable BGP graceful restart, which causes the adjacent routers to keep routes active while the BGP peering is restarted on the FortiGate. This is useful in HA instances when failover occurs.

Advanced Options

Various advanced settings, such as Local Preference, Distance internal, Keepalive, Holdtime, and others

Best Path Selection

Configure path selection attributes on this router.

This section includes the following topics:

More Links

BGP

Border Gateway Protocol (BGP) is a standardized routing protocol that is used to route traffic across the internet. It exchanges routing information between Autonomous Systems (AS) on the internet and makes routing decisions based on path, network policies, and rule sets. BGP contains