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## Policy Resources Overview

The maximum number of policies that you can attach to interfaces on an E-series router depends on the classifier entries that make up the policy and the number of attachment resources available on the interface. JUNOSe software allocates interface attachment resources when you attach policies to interfaces. See Interface Attachment Resources Overview for information about attachment resources.

An E-series router supports software and hardware classifiers. A policy can be made up of any combination of software and hardware classifiers. You use the classifier-list command to configure all classifiers.

There are two categories of hardware classifiers, depending on the type of line module being used. OC48/STM16, GE-2, and GE-HDE line modules support content-addressable memory (CAM) hardware classifiers—all other line modules support FPGA hardware classifiers. Table 17 lists the classifiers supported on OC48/STM16, GE-2, and GE-HDE line modules; Table 18 lists the classifiers supported on all other line modules.

Table 17: Classifier Support (OC48/STM16, GE-2, and GE-HDE Line Modules)

Interface Type | Hardware Classifier | Software Classifier
--- | --- | ---
All interface types (except IP and IPv6) | – | Color Traffic class User packet class
Frame Relay | Not supported | DE bit
GRE tunnels | Not supported | ToS
IP | Color Destination address Destination port Destination route class ICMP type and code IGMP type IP flags IP fragmentation Local Protocol Source address Source port Source route class TCP flags ToS Traffic class User packet class | Not supported
IPv6 | Color Destination address Destination port Destination route class ICMPv6 type and code Local Protocol Source address Source port Source route class TC flags TCP flags Traffic class User packet class | Not supported
MPLS | Not supported | EXP
VLAN | Not supported | User priority

Table 18: Classifier Support (All Line Modules Except OC48/STM16, GE-2, and GE-HDE)

Interface Type | Hardware Classifier | Software Classifier
--- | --- | ---
All interface types | – | Color Traffic class User packet class
Frame Relay | Not supported | DE bit
GRE tunnels | Not supported | ToS
IP | Destination address Destination port ICMP type and code IGMP type Protocol Source address Source port | Destination route class IP flags IP fragmentation Local Source route class TCP flags ToS
IPv6 | Destination address Destination port ICMPv6 type and code Protocol Source address Source port | Destination route class Local Source route class TC field TCP flags
MPLS | Not supported | EXP
VLAN | Not supported | User priority

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