Table Of Contents

Ethernet QoS Policy Parameters

Service Level Ethernet QoS Parameters

Service Class Parameters

Link Level Ethernet QoS Parameters

Ethernet QoS Policy Parameters

---

This appendix describes the parameters, both required and optional, for Ethernet QoS provisioning using the Cisco IP Solution Center (ISC) user interface.

This appendix contains the following sections:

•Service Level Ethernet QoS Parameters

•Link Level Ethernet QoS Parameters

Service Level Ethernet QoS Parameters

Service level Ethernet QoS parameters include the entry fields in the service class windows and dialog boxes. However, the Ethernet QoS policy is not pre-populated with any Class of Service. These must be added using the Add CoS button on the Edit Ethernet QoS Policy page.

You must enter the bandwidth parameter for all service classes. Typically, a value of one percent is sufficient for Routing Protocol traffic. However, it is common for customers or providers to combine the Management and Routing Protocol into one service class policy. In this case, a larger percentage of bandwidth might be required.

Any class of service can be a class-default class of service. You can simply name the class of service as class-default and ISC will generate the same. Bandwidth is not mandatory for this class of service. Traffic classification is assumed to be rest of traffic.

---

Note Class-default is a reserved class of service name in IOS and is created by IOS if ISC does not create one.

---

Service Class Parameters

Each service class is characterized by a set of parameters that are defined in the Edit Service Class window (Figure C-1).

Figure C-1 Edit Service Class

Table C-1 provides a definition for each of the service class parameters.

Table C-1 Edit Service Class Entry Fields 

Entry Field	Description
General
Service Name	The name of the service class. Max. 8 characters in length. use "class-default": Check the "use Class Default" check box if you want the service class to be a class-default class.
Traffic Classification
All Traffic	Check this box if the policy is to be applied to all traffic.
COS (0-7)	A class of service.
DSCP	Traffic classification based on the packet's DSCP marking.
IP Precedence	Traffic classification based on the packet's IP Precedence marking.
Marking
Enabled	Enable packet marking.
Set	Three options: •COS: Mark packets with 802.1p Class of Service Marking. •DSCP: Mark packets with a DSCP value. Note: You can mark packets with either DSCP or IP Precedence, but not both. •IP Precedence: Mark packets with an IP Precedence value.
Trust	Defines which markings should be trusted in the QoS Policy.
Rate Limiting (VoIP service class only)
Enabled	Enable rate-limiting.
Rate Limit Type	This sets which type of policer is created and, therefore, which values are required. Two options: •One rate two color •Two rate three color
Mean Rate	The long-term average transmission rate.
Peak Information Rate	Allows support for sustained excess rate.
Conformed Burst Size	How large traffic bursts can be before some traffic exceeds the rate limit.
Extended or Peak Burst Size	How large traffic bursts can be before all traffic exceeds the rate limit. Configure extended burst by setting the extended burst value greater than the conformed burst value.
Conform Action-	The action to take on packets that conform to the specified rate limit: •transmit—Sends the packet. •drop—Drops the packet. •policed-dscp-transmit—Marks down the DSCP value and then transmits. •set-cos-transmit—Sets the L2 CoS value and transmits the packet. •set-dscp-transmit—Sets the DSCP value and transmits the packet. •set-prec-transmit—Sets the IP precedence (0 to 7) value and sends the packet.
Exceed Action-	The action to take on packets that conform to the specified rate limit. •transmit—Sends the packet. •drop—Drops the packet. •policed-dscp-transmit—Marks down the DSCP value and then transmits. •set-cos-transmit—Sets the L2 CoS value and transmits the packet. •set-dscp-transmit—Sets the DSCP value and transmits the packet. •set-prec-transmit—Sets the IP precedence (0 to 7) value and sends the packet.
Violate Action-	The action to take on packets that conform to the specified rate limit. •transmit—Sends the packet. •drop—Drops the packet. •policed-dscp-transmit—Marks down the DSCP value and then transmits. •set-cos-transmit—Sets the L2 CoS value and transmits the packet. •set-dscp-transmit—Sets the DSCP value and transmits the packet. •set-prec-transmit—Sets the IP precedence (0 to 7) value and sends the packet.
Congestion Management	(Applicable to 3750-ME only)
Enabled	Enable congestion management.
Priority	Assign a traffic class to the strict priority queue
Bandwidth	The bandwidth in kbps (absolute bandwidth) or percent for this service class to dedicate to congestion management parameters.
Queue Limit in Packets	Limit the queue depth of the congesting traffic. The range is 1 to 32768 packets.

---

Note The process for marking packets with DSCP and IP Precedence bits is described in detail in the following document on Cisco.com: http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a00800949f2.shtml

---

Link Level Ethernet QoS Parameters

This section describes the link level QoS parameters for Ethernet link QoS settings. These settings are intended for either the VLAN level or the interface level.

Figure C-2 Link QoS Settings

The Ethernet Link QoS Settings window displays the current link QoS settings available for QoS service requests, including the following information about each link QoS setting:

•Set Name—The name of your link QoS setting.

•Owner—Customer or provider.

•Shape Average—Enable VLAN level average-rate traffic shaping. It limits the affected traffic to a certain data transmission rate in bps.

•Bandwidth—Desired VLAN level bandwidth. Enter this value manually in kbps or percent to allocate a minimum bandwidth for the VLAN.

•Trust—Port level trust

–Enable—Check this box to enable trust.

–Trust COS—Trust CE L2 CoS.

- Enable COS Mutation—Enable CE L2 CoS classification for 7600 L2VPN EWS and VPLS. (See General Metro Ethernet Service Types for a definition of Metro Ethernet terminology.)

–Trust DSCP—Trust CE DSCP.