Router Dynamic BGP
FortiGate Version 3.0 MR4 Administration Guide
01-30004-0203-20070102 203
BGP updates advertise the best path to a destination network. When the
FortiGate unit receives a BGP update, the FortiGate unit examines the Multi-Exit
Discriminator (MED) attributes of potential routes to determine the best path to a
destination network before recording the path in the FortiGate routing table.
BGP has the capability to gracefully restart. This capability limits the effects of
software problems by allowing forwarding to continue when the control plane of
the router fails. It also reduces routing flaps by stabilizing the network.
Viewing and editing BGP settings
When you configure BGP settings, specify the AS that includes the FortiGate unit
as a member and enter a router ID to identify the FortiGate unit to other BGP
routers. You must also identify the FortiGate unit’s BGP neighbors and specify
which of the networks local to the FortiGate unit should be advertised to BGP
neighbors.
To view and edit BGP settings, go to Router > Dynamic > BGP. The web-based
manager offers a simplified user interface to configure basic BGP options.
A large
number of advanced BGP options can be configured through the CLI. For more
information, see the “router” chapter of the FortiGate CLI Reference.
Figure 113:Basic BGP options
Note: Graceful restarting and other advanced settings cannot be configured through the
web-based manager, only through CLI commands. For complete descriptions and
examples of how to use CLI commands to configure BGP settings, see the “router” chapter
of the FortiGate CLI Reference.
Local AS Enter the number of the local AS that the FortiGate unit is a member of.
Router ID Enter a unique router ID to identify the FortiGate unit to other BGP
routers. The router ID is an IP address written in dotted-decimal format.
If you change the router ID while BGP is running, all connections to BGP
peers will be broken temporarily until they are re-established.
Neighbors The IP addresses and AS numbers of BGP peers in neighboring
autonomous systems.
IP Enter the IP address of the neighbor interface to the BGP-
enabled network.
Remote AS Enter the number of the AS that the neighbor belongs to.
Add/Edit Select to add the neighbor information to the Neighbors list,
or edit an entry in the list.
Neighbor The IP addresses of BGP peers.
Remote AS The numbers of the autonomous systems associated with
the BGP peers.
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