configure ospfv3 area external-filter

configure ospfv3 area area_identifier external-filter [policy_map |none]


Configures an external filter policy.

Syntax Description

area_identifier Specifies the OSPFv3 target area.
policy_map Specifies a policy.
none Specifies not to apply an external filter (removes the existing policy, if any).



Usage Guidelines

For switches configured to support multiple OSPFv3 areas (an ABR function), a policy can be applied to an OSPFv3 area that filters a set of OSPFv3 external routes from being advertised into that area, in other words, filtering some of the inbound AS-external-LSAs.

OPSFv3 routers that do not have enough memory to hold the entire AS-external-LSAa should configure an external area filter to drop part of the external-LSAs. Configuring this policy will enable routers with limited resources to be put into an OSPFv3 network.

Using the none mode specifies that no external filter is applied.

Policy files for this command will only recognize the following policy attributes:
  • Match attributes:
    • nlri IPv6-address/mask-len
  • Action (set) attributes
    • permit
    • deny

Any other policy attribute will not be recognized and will be ignored.

The following is an example of an external filter policy file:

entry one {
	if match any{
		nlri 2001:db8:3e5c::/48;
		nlri 2001:db8:2146:2341::/64;
	} then {


The following command configures an external filter policy, nosales for area

configure ospfv3 area external-filter nosales


This command was first available in ExtremeXOS 11.2.

Platform Availability

This command is available on platforms with an Advanced Edge or Base license, or higher, as described in the ExtremeXOS and Switch Engine 31.7 Feature License Requirements document.