Policies and Filters

Policies

A policy is a set of rules that defines how the device handles packets. Table C.3 lists the types of policies you can configure on the routing switches and the switch.

Table C.3: Policies

Policy Type

 

Supported on...

See page...

 

 

 

 

 

 

 

Routing

Switch

 

 

 

Switch

 

 

 

 

 

 

 

Quality-of-Service (QoS) Policies

X

 

X

5

 

 

 

 

 

Layer 3 Policies

 

 

 

6

 

 

 

 

 

Protocol-based VLANs – either forward or drop Layer 3 traffic

X

 

X

6

based on protocol (or, for IP sub-net VLANs and IPX network

 

 

 

 

VLANs, sub-net or network address)

 

 

 

 

 

 

 

 

 

IP access policies – either forward or drop IP packets

X

 

 

7

 

 

 

 

 

Layer 4 Policies

 

 

 

28

 

 

 

 

 

TCP/UDP access policies – either forward or drop packets based

X

 

X

9

on TCP or UDP port

 

 

 

 

 

 

 

 

 

Quality-of-Service Policies

The routing switches and switch support Quality-of-Service (QoS) through implementation of 802.1p/q prioritization. You can configure QoS policies for packets associated with the following items:

•Ports

•VLANs

•Static MAC entries

•Layer 4 sessions

•AppleTalk sockets.

The default queue for all packets is normal (or 0). You can change QoS policy by placing a port, VLAN, static MAC entry, Layer 4 session, or AppleTalk socket into a higher queue. See “Quality of Service (QoS)” on page 2­ 1 for more information about the QoS algorithm.

Actions

QoS policies place packets in the specified queue for forwarding.

Scope

You can apply QoS policies to individual ports, VLANs, static MAC address, Layer 4 sessions, and AppleTalk sockets. If a port is a member of two or more of these items and has different priorities, the priorities are merged. However, the resulting priority is never lower than the highest priority.

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