Advanced Configuration and Management Guide

Scope

You define BGP4 AS-path filters globally, then apply them as part of a BGP4 neighbor’s distribute list or as part of a match statement in a route map.

Syntax

Use the following CLI commands or Web management interface panels to configure BGP4 AS-path filters.

Table C.21: BGP4 AS-Path Filters

CLI syntax

Web management links

 

 

HP9300(config-bgp-router)# as-path-filter <num> permit deny

Configure->BGP->AS Path Filter

<as-path>

 

HP9300(config-bgp-router)# neighbor <router-id>

Configure->BGP->Neighbor

remote-as <as-number> [advertisement-interval <num>]

 

[distribute-list in out <num,num,...>] [ebgp-multihop]

 

[filter-list in out <num,num,...>] [maximum-prefix <num>]

 

[next-hop-self] [remote-as <as-number>] [route-map <map-name>]

 

[send-community] [weight <num>]

 

HP9300(config-bgp-routemap RMAP_NAME)# match

Configure->BGP->Route Map Filter

as-path-filters community-filters address-filters <num,num,...>

 

[metric <num>] [next-hop <ip-addr>]

 

[route-type internal external-type1 external-type2]

 

[tag <tag-value>]

 

 

 

NOTE: The <as-path> value can be a regular expression. See “Using Regular Expressions” on page 10-49.

NOTE: The neighbor command adds a BGP neighbor. The filter-listparameter specifies a list of AS-path filters and whether the list is applied to inbound or outbound BGP updates.

NOTE: The match command compares the information you configure for the command’s parameters against BGP routes. You use this command when configuring a route map. If the comparison matches a route, set statements in the route map specify the action to take. See “Defining Route Maps” on page 10-59.

BGP4 Community Filters

BGP4 community filters control whether the device learns or drops BGP4 route information based on the route’s community membership.

Actions

•A BGP4 community filter applied to inbound packets permits (learns) or denies (drops) routes for networks with the specified community membership in BGP4 updates received from a BGP4 neighbor.

•A BGP4 AS-path filter applied to outbound packets permits (advertises) or denies (drops) routes for networks with the specified community membership in BGP4 updates sent to a BGP4 neighbor.

Scope

You define BGP4 community filters globally, then apply them as part of a BGP4 neighbor's distribute list or as part of a match statement in a route map.

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