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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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MPLS LDP Inbound Label Binding Filtering

You can filter out incoming label bindings from an LDP neighbor. In effect, this is the opposite of the feature that prevents the advertising of label bindings. You can use the inbound label binding filtering on the receiving LDP peer if you cannot apply the outbound filtering of label bindings, as described in the previous section. This feature can limit the number of label bindings stored in the LIB of the router. For instance, you can filter out all received label bindings from the LDP peers, except for the label bindings of the loopback interfaces of PE routers in an MPLS VPN network. Usually, these loopback interfaces have the BGP next-hop IP addresses, and the LSRs can use the label associated with ...

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