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Cisco® BGP-4 Command and Configuration Handbook (CCIE Professional Development) by William R. Parkhurst Ph.D.

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8-10. neighbor {ip-address | peer-group-name} filter-list as-path-list-number in

Syntax Description:

  • ip-address— Neighbor's IP address.

  • peer-group-name— Name of the peer group. See section 8-19.

  • as-path-list-number— IP AS path list number.

Purpose: To filter incoming route updates from a particular BGP neighbor. Filtering is based on AS path information. Only one filter list can be used per neighbor. The operation of the input filter list is identical for both IBGP and EBGP neighbors.

Cisco IOS Software Release: 10.0. Peer group support was added in Release 11.0.

Configuration Example 1: Block Routes Originating from a Particular AS

In Figure 8-11, Routers B and C are advertising four network prefixes. Router A filters the route update from Router ...

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