Foundry Networks Switch and Router Installation And Configuration Manual page 1010

Foundry Switch and Router Installation and Configuration Guide
Policy Type
Cache Server redirection policies – either redirect
HTTP packets to cache servers or send the
packets to the Internet
Note: This type of policy applies only to the
ServerIron Transparent Cache Switching (TCS)
feature.
a. Router acceleration is supported only on the FastIron Backbone and TurboIron Backbone Layer 2
Switches.
Quality-of-Service Policies
Foundry devices support Quality-of-Service (QoS) through implementation of 802.1q prioritization. You can
configure QoS policies for packets associated with the following items:
• Ports
• VLANs
• Static MAC entries
• Layer 4 sessions
• AppleTalk sockets.
The QoS levels provided by a Foundry device differ depending on the device:
• The Chassis devices (NetIron Internet Backbone router, BigIron, FastIron II, and chassis-based ServerIron)
and the TurboIron/8 provide four weighted queues: 0 (normal) – 3 (highest priority).
• The Stackable devices (FastIron Workgroup, FastIron Backbone, TurboIron
ServerIron) provide two QoS queues: normal and high.
NOTE: The ServerIron also provides a "cache" QoS queue. This queue applies only to Transparent Cache
Switching (TCS) and enables the feature.
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 "IronClad Quality of Service (QoS)" on
page 11-1 for more information about the Foundry QoS algorithms.
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.
1.4- to 6-port Gigabit Layer 2 Switch
C - 6
Table C.3: Foundry Policies (Continued)
Supported on...
Router Switch ServerIron
X
1
, NetIron, and stackable
See page...
C-22
December 2000