Configuring BGP Miscellaneous Settings in Gaia Portal

From the left navigation tree, click Advanced Routing > BGP.
In the Miscellaneous Settings section, configure the applicable settings.
Click Apply.

Parameter

Description

Default MED

Defines the metric (MED) used when advertising routes through BGP.

If you do not specify a value, no metric is propagated.

A metric specified on the neighbor configuration or in the redistribution configuration might override the metric you configure.

Range: 0-65535

Default: None

Default Gateway:

A default route is generated when any BGP peer is up.

This route has a higher rank than the default configured in the static routing page.

If a specific BGP peer should not be considered for generating the default route, you should explicitly suppress the option in the peer-specific configuration.

Range: Dotted-quad ([0-255].[0-255].[0-255].[0-255])

Default: None

Enable IGP Synchronization

Select this option to make internal and configured BGP peers check for a matching route from IGP protocols before installing a given route.

Default: Unselected

Enable communities

Enables communities-based policy options.

Default: Unselected

Enable ECMP

Enables Equal-Cost Multi-Path (ECMP) routing strategy.

ECMP is a load-balancing routing strategy.

The BGP RFC does not support ECMP routes because BGP clearly sets the route selection criteria.

To overcome this issue and install ECMP route through a BGP user, enable the ECMP option.

Note - BGP ECMP is not supported for routes that are received by a mix of iBGP and eBGP.

Default: Unselected

Graceful Restart Time

Specifies the time (in seconds) that BGP peers of this router should keep the routes advertised to them while this router restarts.

If the BGP session is not re-established within this time, the peers will delete the routes.

If this router re-establishes the session(s) with its peer(s) before this timer expires, the peers will schedule the stale-path-timer to re-validate the routes advertised by this router.

See sk100499.

Range: 1-4095

Default: 360

Graceful Restart Selection Deferral Time

Specifies the time (in seconds) that this router will wait for the End-of-RIB notification from each of its BGP peers after a restart.

After a restart or cluster Two or more Security Gateways that work together in a redundant configuration - High Availability, or Load Sharing. failover, the cluster master has to re-validate the routes it had previously received from each of the BGP peers.

The old routes will be kept till either all the peers have sent the End-of-RIB or this timer expires.

Any routes not re-validated are deleted.

See sk100499.

Range: 60-4095

Default: 360

Enable Weighted Route Dampening

Select this option and see the next section Weighted Route Dampening Settings.

Default: Unselected

Ping interval

Specifies the interval between pings sent to all BGP peers with ping enabled.

Range: 1-60

Default: 2

Ping Count

Specifies the number of failed pings to an individual BGP peer with ping enabled before BGP will drop that peer.

This value is common across all BGP peers.

Range: 1-10

Default: 3

Weighted Route Dampening Settings

Parameter

Description

Enable Weighted Route Dampening

Weighted route dampening minimizes the propagation of flapping routes across an internetwork.

A route is considered to be flapping when it is repeatedly transitioning from available to unavailable, or the other way around.

Only routes learned through BGP are subjected to weighted route dampening.

Note - BGP route dampening is supported only for External BGP (eBGP).

When this option is selected, the other Route Dampening fields show.

Reuse-below metric

The value of the instability metric at which a suppressed route becomes unsuppressed if it is reachable but currently suppressed.

The value assigned to the reuse-below metric must be less than the suppress-above value.

Range: 1-32

Default: 2

Suppress-above metric

The value of the instability metric at which a route is suppressed; a route is not installed in the FIB or announced even if it is reachable during the period that it is suppressed.

Range: 2-32

Default: 3

Max-flap metric

The upper limit of the instability.

The value must be higher than one plus the suppress-above value.

The metric assigned to the suppress-above, reuse-below, and max-flap metric values is a floating point number, in units of flaps.

Each time a route becomes unreachable, one is added to the current instability metric.

Range: 3-64

Default: 16

Reachable decay time

A value that determines the length of time it takes for the instability metric value to reach one half of its current value when the route is reachable.

This half-life value determines the rate at which the metric value is decayed.

A smaller half-life value makes a suppressed route reusable sooner than a greater value.

Range: 1-900

Default: 300

Unreachable decay time

The rate at which the instability metric is decayed when a route is unreachable.

This value must be equal to or greater than the reach-decay value.

Range: 1-2700

Default: 900

Keep history time

The period over which the route flapping history is maintained for a given route.

The size of the configuration arrays described below is directly affected by this value.

Range: 2-5400

Default: 1800