# Viewing the QoS configuration

Use this procedure to open the Configuration tab.

## Procedure steps

1. From the navigation tree, double-click QoS.

2. From the QoS tree, double-click QoS Agent.

3. Select the Configuration tab.

## Variable definitions

The following table outlines the parameters of the Configuration tab.

Table 1. QoS Agent Configuration tab parameters
Variable | Value
--- | ---
QosOperMode | Specifies whether the QoS Agent support is enabled or disabled.
NVRamCommitDelay | Specifies the maximum time before nonvolatile QoS data is written to NVRAM.
ResetToPartialDefaults | Resets QoS configurations to default except for queue-set and buffering type.
ResetToDefaults | Resets all policy information to factory default values.
QueueCfg | Determines the queue set that is associated with all egress interfaces by default.
BufferingCaps | Determines the method through which buffering resources are allocated to ports sharing a pool of buffers. The value of this attribute determines the level of buffer sharing or over-allocation that can take place among ports sharing a buffer pool. Higher levels of over-allocation increase the likelihood (under heavy load) of a relatively few number of ports consuming all the buffers in a pool, causing packets to be dropped on other ports due to buffer starvation.
UBPSupportLevel | Sets the level of user-based policy support.
TrackStatistics | Specifies the type of statistics tracking.
AQApplicationMode | Specifies the behavior of Auto Qos application mode.
TrustedProcessingMode | Indicates the QoS trusted processing mode status. The trusted processing mode parameter is available only for a mixed stack of ERS 5500 Series switches.
TrustedProcessingMode | Trusted processing mode: partialDscpMapping (less QoS filters used) or fullDscpMapping (64 QoS filters used).
DappEnable | DoS Attack Prevention Package for ERS 5600 switches only: disable (default), enableWithoutStatusTracking (enabled without logging messages), enableWithStatusTracking (enabled with logging messages).
DappMinTcpHdrSize | Specifies the Dapp minimum TCP header size.
DappIpv4IcmpMaxLength | Specifies the Dapp maximum length for IPv4 ICMP packets.
DappIpv6IcmpMaxLength | Specifies the Dapp maximum length for IPv6 ICMP packets.

This section contains information about the following topics:

- Enabling and disabling QoS agent support

- Enabling automatic QoS

- Disabling automatic QoS

- Configuring the QoS trusted processing mode

- Enabling DoS Attack Prevention Package (DAPP)

- Configuring DAPP minimum TCP header size

- Configuring DAPP maximum IPv4 ICMP length

- Configuring DAPP maximum IPv6 ICMP length