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Configuring Filter-Based Forwarding

Configure a firewall filter that forces a lookup against the different routing tables. Any routes that match the forwarding class specified and then match a specified topology are installed in the routing table for that topology. To configure a firewall filter for MTR that performs filter-based forwarding, include the following configuration at the [edit firewall] hierarchy level:



[edit firewall]
family inet { # inet6 is also supported.


filter topology-selection {


term ef {


from {
forwarding-class expedited-forwarding; # The following
class types are also 
# supported: assured-forwarding, best-effort, and network-control.
}




then {
topology voice; # Specify the name of a configured topology.
accept;
}


}


}


}

You must apply the filter to an ingress interface. Include the following statements at the [edit interfaces] hierarchy level to apply the filter to an interface:



[edit interfaces]
fe-2/2/1 {


unit 0 {


family inet {


filter {
input topology-selection; # Specify the name of the filter
configured under 
# the [edit firewall] hierarchy
}


}


}


}

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