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Filtering Frames by Packet Loss Priority

To configure an MX-series firewall filter to provide matching on the packet loss priority (PLP) level carried in the frame, use the loss-priority or loss-priority-except match condition. Packet loss priority matching is available for all protocols. For more detailed information about configuring firewall filters and configuring filter match conditions for Layer 2 bridging traffic on the MX-series routers, see the JUNOS Policy Framework Configuration Guide.

Note: Layer 2 bridging is supported only on the MX-series routers. For more information about how to configure Layer 2 bridging, see the JUNOS Network Interfaces Configuration Guide, the JUNOS Routing Protocols Configuration Guide, and the JUNOS Feature Guide.

This example Layer 2 bridging firewall filter finds any incoming frames with a packet loss priority (PLP) level of medium-high, and then classifies the packet in the expedited-forwarding default forwarding class.

Firewall Filter

Configure the firewall filter filter-plp-configure-forwarding:



[edit firewall]
family bridge {


filter filter-plp-configure-forwarding {


term 0 {


from {


loss-priority medium-high;


}


then forwarding-class expedited-forwarding;
}


}


}

Enable Bridging Domain on Customer Interface

Configure a Layer 2 bridging domain bd for the ge-0/0/0 interface (that has already been configured at the [edit interfaces] hierarchy level):



[edit]
bridge-domains bd {


domain-type bridge {


interface ge-0/0/0;


}


}

Apply Filter to Customer interface

Apply the filter filter-plp-configure-forwarding as an input filter to the ge-0/0/0 interface:



[edit]
interfaces {


ge-0/0/0 {


unit 0 {


family bridge {


filter {


input filter-plp-configure-forwarding; 


}


}


}


}


}

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