Route aggregation is the act of combining specific routes (those
with a longer prefix length) into a single route (with a shorter
prefix length) to reduce routing advertisements that the firewall
must send and to have fewer routes in the route table.
BGP Aggregate Settings
Configure In
Description
Name
BGPAggregate
Enter a name for the aggregation rule.
Prefix
Enter a summary prefix (IP address/prefix
length) that will be used to aggregate the longer prefixes.
Enable
Select to enable this aggregation of routes.
Summary
Select to summarize routes.
AS Set
Select to cause the firewall, for this aggregation
rule, to include the set of AS numbers (AS set) in the AS path of the
aggregate route. The AS set is the unordered list of the origin
AS numbers from the individual routes that are aggregated.
Name
BGPAggregateSuppress Filters
Define the attributes that will cause the
matched routes to be suppressed. Add and
enter a name for a Suppress Filter.
Enable
Select to enable the Suppress Filter.
AS Path Regular Expression
Specify a regular expression for AS_PATH
to filter which routes will be aggregated, for example, ^5000 means
routes learned from AS 5000.
Community Regular Expression
Specify a regular expression for communities
to filter which routes will be aggregated, for example, 500:.* matches
communities with 500:x.
Extended Community Regular Expression
Specify a regular expression for extended
communities to filter which routes will be aggregated.
MED
Specify the MED that filters which routes
will be aggregated.
Route Table
Specify which route table to use for aggregated
routes that should be suppressed (not advertised): unicast, multicast,
or both.
Address Prefix
Enter the IP address that you want to suppress
from advertisement.
Next Hop
Enter the next hop address of the BGP prefix
that you want to suppress.
From Peer
Enter the IP address of the peer from which
the BGP prefix (that you want to suppress) was received.
Name
BGPAggregateAdvertise Filters
Define the attributes for an Advertise Filter
that causes the firewall to advertise to peers any route that matches the
filter. Click Add and enter a name for the
Advertise Filter.
Enable
Select to enable this Advertise Filter.
AS Path Regular Expression
Specify a regular expression for AS_PATH
to filter which routes will be advertised.
Community Regular Expression
Specify a regular expression for Community
to filter which routes will be advertised.
Extended Community Regular Expression
Specify a regular expression for Extended
Community to filter which routes will be advertised.
MED
Specify a MED value to filter which routes
will be advertised.
Route Table
Specify which route table to use for an
Advertise Filter of aggregate routes: unicast, multicast,
or both.
Address Prefix
Enter an IP address that you want BGP to
advertise.
Next Hop
Enter the Next Hop address of the IP address
you want BGP to advertise.
From Peer
Enter the IP address of the peer from which
the prefix was received, that you want BGP to advertise.
BGPAggregateAggregate Route Attributes
Define the attributes for the aggregate
route.
Local Preference
Local preference in the range 0-4,294,967,295.
MED
Multi Exit Discriminator in the range 0-4,294,967,295.
Weight
Weight in the range 0-65,535.
Next Hop
Next Hop IP address.
Origin
Origin of the route: igp, egp,
or incomplete.
AS Path Limit
AS Path Limit in the range 1-255.
AS Path
Select Type: None or Prepend.
Community
Select Type: None, Remove
All, Remove Regex, Append,
or Overwrite.
Extended Community
Select Type: None, Remove
All, Remove Regex, Append,
or Overwrite.
