Management Prioritizing; Handling Of Received Priority Information - Hirschmann RS20 User Manual

Network load control

7.4.4 Management prioritizing

In order for you to have full access to the management of the device, even
when there is a high network load, the device enables you to prioritize man-
agement packets.
In prioritizing management packets (SNMP, Telnet, etc.), the device sends
the management packets with priority information.
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.
On Layer 3 the device modifies the IP-DSCP value.

7.4.5 Handling of received priority information

The device provides three options, which can be chosen globally for all ports
(per port for Power MICE and MACH 4000), for selecting how it handles re-
ceived data packets that contain priority information.
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 111 „VLAN
signment. The device assigns the port priority to packets that it receives
without a tag.
untrusted
The device ignores the priority information in the packet and always as-
signs the packets the port priority of the receiving port.
trust ip-dscp
The device assigns 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
You can modify this assignment.
The device prioritizes non-IP packets according to the port priority.
116
tagging"). You can modify this as-
Basic Configuration L2P
7.4 QoS/Priority
(see table 7).
Release 4.2 07/08