The ip large-community-filter advanced command sets an advanced Large-Community filter.
The undo ip large-community-filter advanced command deletes an advanced configured Large-Community filter.
By default, no advanced Large-Community filter is configured.
| Parameter | Description | Value |
|---|---|---|
| large-comm-filter-name |
Specifies the name of an advanced Large-Community filter. |
The value is a string of 1 to 51 case-sensitive characters. The string cannot be all digits. |
| index index-number |
Specifies the index of a Large-Community filter. |
The value is an integer ranging from 1 to 4294967295. |
| matchMode |
Sets the matching mode of a Large-Community filter. |
The value is an enumerated type:
|
| regular-expression |
Specifies a regular expression that matches BGP routes with the Large-Community attribute. |
The value is a string of 1 to 1024 characters without spaces. |
| advanced |
Sets an advanced Large-Community filter. |
- |
Usage Scenario
The Large-Community attribute is a private attribute of BGP and can be flexibly applied to route-policies. The ip large-community-filter command works with the if-match large-community-filter command so that a filtering rule based on a specific Large-Community filter can be used to filter BGP routes.
Follow-up Procedure
Run the display ip large-community-filter command to view detailed configuration of the Large-Community filter.
Precautions
The relationship between the rules in a Large-Community filter is "AND", which is different from that in an RD filter. This is because each route has only one RD but can have multiple Large-Community values.
By default, a Large-Community filter works in deny mode. BGP routes that fail one of the filtering rules do not match the Large-Community filter. If all matching rules in a Large-Community filter work in deny mode, all BGP routes are denied by the filter. To prevent this problem, configure a matching rule in permit mode after one or more matching rules in deny mode so that the routes except for those denied by the preceding filtering rules match the filter.