Quality of Service
Configuring QoS Basic Mode
Cisco 220 Series Smart Switches Administration Guide Release 1.1.0.x 261
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STEP 4 Click Apply. The Running Configuration is updated.
Configuring TCP Congestion Avoidance
Use the TCP Congestion Avoidance page to activate the TCP congestion
avoidance algorithm. The algorithm breaks up or avoids TCP global
synchronization in a congested node, where the congestion is due to various
sources sending packets with the same byte count.
To configure TCP congestion avoidance:
STEP 1 Click Quality of Service > General > TCP Congestion Avoidance.
STEP 2 Enable or disable TCP congestion avoidance.
STEP 3 Click Apply. The Running Configuration is updated.
Configuring QoS Basic Mode
In QoS basic mode, a specific domain in the network can be defined as trusted.
Within that domain, packets are marked with 802.1p priority and/or DSCP to signal
the type of service they require. Nodes within the domain use these fields to
assign the packet to a specific output queue. The initial packet classification and
marking of these fields is done in the ingress of the trusted domain.
To configure QoS basic mode, perform the following:
STEP 1 Select the QoS basic mode for the switch as described in the Configuring QoS
Properties section.
STEP 2 Select the trust behavior as described in the Configuring Basic QoS Trust Mode
section. The switch supports four trusted modes: CoS/802.1p, DSCP, IP
precedence, and CoS/802.1p-DSCP. CoS/802.1p trusted mode uses the 802.1p
priority in the VLAN tag. DSCP trusted mode use the DSCP value in the IP header.
STEP 3 If there is any port that, as an exception, should not trust the incoming CoS mark,
disable the QoS state on that port on the Interface Settings page, as described in
the Configuring Basic QoS Interface Settings section.
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