Network Load Control
148
8.4
QoS/Priority
Basic Configuration
Release
6.0
07/2010
8.4.4 Management prioritization
To have full access to the management of the device, even in situations of
high network load, the device enables you to prioritize management packets.
In prioritizing management packets (SNMP, Telnet, etc.), the device sends
the management packets with priority information.
X On Layer 2 the device modifies the VLAN priority in the VLAN tag.
For this function to be useful, the configuration of the corresponding ports
must permit the sending of packets with a VLAN tag.
X On Layer 3 the device modifies the IP-DSCP value.
8.4.5 Handling of Received Priority Information
The device offers you 3 options to select globally for all ports (per port for
PowerMICE, MACH 104, MACH 1040 and MACH 4000) how it handles
received data packets that contain priority information.
X trust dot1p
The device assigns VLAN-tagged packets to the different traffic classes
according to their VLAN priorities. The assignment is based on the pre-
defined table (see on page 142 “VLAN tagging“). You can modify this
assignment. The device assigns the port priority to packets that it receives
without a tag.
X untrusted
The device ignores the priority information in the packet and always
assigns the packets the port priority of the receiving port.
X trust ip-dscp
The device asbs the IP packets to the different traffic classes according
to the DSCP value in the IP header, even if the packet was also VLAN-
tagged. The assignment is based on the pre-defined values (see
table 15). You can modify this assignment.
The device prioritizes non-IP packets according to the port priority.
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