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Route filtering 编辑

For networks with Route Learning enabled, Citrix SD-WAN provides more control over which SD-WAN routes are advertised to routing neighbors rather and which routes are received from routing neighbors, rather than advertising and accepting all or no routes.

Export Filters are used to include or exclude routes for advertisement using OSPF and BGP protocols based on specific match criteria. Export filter rules are the rules that have to be meet when advertising SD-WAN routes over dynamic routing protocols. All the routes are advertised to peers by default.
Import Filters are used to accept or not accept routes which are received using OSPF and BGP neighbors based on specific match criteria. Import filter rules are the rules that have to be meet before importing dynamic routes into the SD-WAN route database. No routes are imported by default.

Route filtering is implemented on LAN routes and Virtual Path routes in an SD-WAN network (Data Center/Branch) and is advertised to a non-SD-WAN network through using BGP and OSPF.

You can configure up to 512 Export Filters and 512 Import Filters. This is the overall limit, not per routing domain limit.

Configure export filters

In the Configuration Editor, navigate to Connections > Regions > Site > OSPF or BGP > Export Filters.

Export filters

Use the following criteria to construct each Export Filter that you want to create.

Field Criteria	Description	Value
Order	The Order in which filters are prioritized. The first filter that a route matches are applied to that route	100, 200, 300, 400, 500, 600
Network Address	Enter the IP address and subnet mask of configured Network Object that describes the route’s network	- IP address
Prefix	To match routes by prefix, choose a match predicate from the menu and enter a Route prefix in the adjacent field	- eq: Equal to, - lt: Less than, - le: Less than or equal to, - gt: Greater than, - ge: Greater than or equal to
Citrix SD-WAN Cost	The method (predicate) and the SD-WAN Route Cost that are used to narrow the selection of routes exported	Numeric value
Service Type	Select the Service types that are assigned to matching routes from a list of Citrix SD-WAN Services	Any, Local, Virtual Path, Internet, Intranet, LAN GRE Tunnel, LAN IPsec Tunnel
Site/Service Name	For Intranet, LAN GRE Tunnel, and LAN IPsec Tunnel, specify the name of the configured Service Type to use	Text string
Gateway IP Address	If you choose LAN GRE Tunnel as the Service Type, enter the gateway IP for the tunnel	IP address
Include	Select the check box to Include routes that match this filter. Otherwise matching routes are ignored	None
Enabled	Select the check box to Enable this filter. Otherwise the filter is ignored	None
Delete	Select the delete icon to delete this filter.	None
Clone	Click the clone icon to make a copy of an existing filter	None

Configure import filters

In the Configuration Editor, navigate to Connections > Regions > Site > OSPF or BGP > Import Filters.

Import filters

Use the following criteria to construct each Export Filter that you want to create.

Field Criteria	Description	Value
Order	The Order in which filters are prioritized. The first filter that a route matches are applied to that route	100, 200, 300, 400, 500, 600
Source Router	The IP address of the source router, it is applicable for iBGP only	- IP address
Destination	The IP address and subnet mask of a route’s destination	- IP address
Prefix	To match routes by prefix, choose a match predicate from the menu and enter a Route prefix in the adjacent field	- eq: Equal to, - lt: Less than, - le: Less than or equal to, - gt: Greater than, - ge: Greater than or equal to
Next Hop	The IP address of the next hop	- IP address
Protocol	The routing protocol using which a route is learned	OSPF or BGP
Route Tag	The OSPF Route tag that the filter matches. OSPF route tags prevent routing loops during mutual redistributing between OSPF and other protocols	Numeric value
Cost	The route cost used to match OSPF routes for importing	Numeric value
AS Path Length	The AS path length used to match BGP routes for importing	Numeric value
Include	Select the check box to Include routes that match this filter. Otherwise matching routes are ignored	None
Enabled	Select the check box to Enable this filter. Otherwise the filter is ignored	None
Delete	Click the delete icon to delete this filter.	None
Clone	Click the clone icon to make a copy of an existing filter	None

Configure Route Policy Filter Templates

You can create multiple import or export filter templates with various filter rules and associate the template at each site.

The user created site level import/export filter rules take more precedence. The template rules follow the user created rules when associated to the site in Route Learning section of Connections.

Import route policy template