User manual

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wEb-bASED bROwSER MANAGEMENT
port, the trafc stream of valid frames on any source port is made available for
analysis.
Select a target port that has a higher speed than the source port. Mirroring a
1000Mbps port onto a 100Mbps port may result in an improperly mirrored stream.
Frames will be dropped if the full duplex rate of frames on the source port exceeds
the transmission speed of the target port. Since both transmitted and received
frames on the source port are mirrored to the target port, frames will be discarded
if the sum trafc exceeds the target port’s transmission rate. This problem reaches
its extreme in the case where trafc on a 1000Mbps full duplex port is mirrored
onto a 100Mbps half duplex port. NOTE: Invalid frames received on the source port
will not be mirrored. These include CRC errors, oversize and undersize packets,
fragments, jabbers, collisions, late collisions and drop events.
Mode: Either “Tx” (default) or “All.” The All mode causes all frames received and
transmitted by the mirrored port to be transmitted out of the sniffer port; Tx mode
causes all frames transmitted by the mirrored port to be transmitted out of the
sniffer port.
Source Port: Options range from “Port 01” to “Port 24.” The selected port is the
port being monitored.
Mirroring Port: Options range from “Port 01” to “Port 24.” The selected port is the
port where a monitoring device should be connected.
QUALITY OF SERVICE
QoS (Quality of Service) enhances communication quality by giving precedence to
certain classes of packets. This device provides Disabled, 802.1p, DSCP and Port
QoS modes. The inspection phase results in the QoS of individual frames being
determined. When these frames are forwarded to the egress port, they’re collected
into one of the priority queues according to the QoS assigned to each frame.
QoS weighting selects the degree of preferential treatment attached to different
priority queues. The ratio of the number of higher QoS to lower QoS frames transmitted
can be programmed. If desired, the user can program that lower QoS frames are
transmitted only after all higher QoS frames have been serviced.
From here, select a QoS mode and click “Apply” to put settings into effect.