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Understanding Filter Profiles

 

Filter profiles are a set of rules that define whether to accept or discard packets that are transiting on an interface on a Juniper Networks EX Series Ethernet Switch or on a radio connected to a Wireless LAN Controller. You configure Filter profiles to determine whether to accept or decline traffic before it enters or exits a port or a radio to which the Filter profile is applied to.

A Filter profile must contain at least one term. Each term consists of the following components:

  • Match conditions—Specify the values or fields that the packet must contain. You can define various match conditions, depending on the device for which you are defining these conditions. For example, for EX Series switches, you can specify a match condition based on the IP source address field, IP destination address field, Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) source port field, IP protocol field, Internet Control Message Protocol (ICMP) packet type, TCP flags, interfaces, and so on. For a wireless device, the match conditions can be based on the source and destination IP or MAC address, and EtherTypes.

  • Action—Specifies what to do if a packet matches the match conditions. Possible actions are to accept or discard the packet or to send the packet to a specific virtual routing interface. In addition, packets can be counted to collect statistical information. If no action is specified for a term, the default action is to accept the packet.

  • Action modifier—Specifies one or more actions for the switch if a packet matches the match conditions. You can specify action modifiers such as the loss priority, policer details, and forwarding class, depending on the type of device on which you are creating the Filter profile.

The maximum number of terms allowed per Filter profile for EX Series switches is:

  • 512 for EX2200 switches

  • 1,436 for EX3300 switches

    Note

    On EX3300 switches, if you add and delete filters with a large number of terms (on the order of 1000 or more) in the same commit operation, not all the filters are installed. You must add filters in one commit operation, and delete filters in a separate commit operation.

  • 7,042 for EX3200 and EX4200 switches—as allocated by the dynamic allocation of ternary content addressable memory (TCAM) for firewall filters.

  • 1,200 for EX4500 and EX4550 switches

  • 1,400 for EX6200 switches

  • 32,768 for EX8200 switches

Note

The on-demand dynamic allocation of the shared space TCAM in EX8200 switches is achieved by assigning free space blocks to firewall filters. Firewall filters are categorized into two different pools. Port and VLAN filters are pooled together (the memory threshold for this pool is 22K) while router firewall filters are pooled separately (the threshold for this pool is 32K). The assignment happens based on the filter pool type. You can share free space blocks only among the firewall filters belonging to the same filter pool type. An error message is generated if you attempt to configure a firewall filter beyond the TCAM threshold.

The Manage Filter Profiles page enables you create, modify, view, and delete Filter profiles.