BGP Advanced Tab
- Network > Virtual Router > BGP > Advanced
Advanced BGP settings include a variety of capabilities. You
can run ECMP over multiple BGP autonomous systems. You can require
eBGP peers to list their own AS as the first AS in an AS_PATH attribute
(to prevent spoofed Update packets). You can configure BGP graceful restart,
a means by which BGP peers indicate whether they can preserve forwarding
state during a BGP restart to minimize the consequences of routes
flapping (going up and down). You can configure route reflectors
and AS confederations, which are two methods to avoid having a full
mesh of BGP peerings in an AS. You can configure route dampening
to prevent unnecessary router convergence when a BGP network is unstable
and routes are flapping.
BGP Advanced Settings | Configure In | Description |
|---|---|---|
ECMP Multiple AS Support | Select if you enable ECMP for a virtual
router and you want to run ECMP over multiple BGP autonomous systems. | |
Enforce First AS for EBGP | Causes the firewall to drop an incoming
Update packet from an eBGP peer that doesn’t list the eBGP peer’s own
AS number as the first AS number in the AS_PATH attribute. This
prevents BGP from further processing a spoofed or erroneous Update
packet that arrives from an AS other than a neighboring AS. Default
is enabled. | |
Graceful Restart | Activate the graceful restart option.
| |
Reflector Cluster ID | Specify an IPv4 identifier to represent
the reflector cluster. A route reflector (router) in an AS performs
a role of re-advertising routes it learned to its peers (rather
than require full mesh connectivity and all peers send routes to
each other). The route reflector simplifies configuration. | |
Confederation Member AS | Specify the autonomous system number identifier
that is visible only within the BGP confederation (also called a
sub-autonomous system number). Use a BGP confederation to divide
autonomous systems into sub-autonomous systems and reduce full mesh
peering. | |
Dampening Profiles | Route dampening is a method that determine
whether a route is suppressed from being advertised because it is flapping.
Route dampening can reduce the number of times routers are forced
to reconverge due to routes flapping. Settings include:
Delete (
) profiles when you no longer need
them. |
