Indu-Sol PROmesh P9+, Руководство пользователя, Страница: 31 / 49

Web application
PROmesh P9+
– User Manual
31
o
Class of service only: Priorities are based solely on the class of service data field of the
packets.
o
Type of service only: Priorities are based solely on the type of service data field of the
packets.
o
Class of service first: In this variant, priorities are determined first by COS, then (if
necessary) by TOS, and finally by port.
o
Type of service first: Here, priorities are determined first by TOS, then (if necessary) by
COS, and finally by port.

Priority scheme:
o
Strict priority scheme: In the strict priority scheme, all packets leave a port until the
associated priority queue is empty. Only then are packets sent from the lower priority
queues. If packets arrive permanently in the highest priority queue, packets in the lowest
priority queue may never be sent. This mode is recommended when there are very high
real-time requirements.
o
Weighted order: This approach prevents low-priority packets from never being sent when
there are permanent high-priority packets to be sent. There is only a slightly higher
latency for the high priority packets. The switch primarily sends high priority packets and
also processes all low priority queues in one send cycle.
VLAN
A virtual LAN (VLAN) is a logical group of network subscribers. It allows the isolation of a network part. Any
traffic from network subscribers of a VLAN group is transferred only within the VLAN group.
In the VLAN menu, VLAN settings can be made for each individual port. You can define port-specific in
which VLAN a port should have its PVID and for which VLANs the port should be untagged or tagged.

Tagged : Ports that are configured as tagged in a VLAN provide packets with a VLAN tag.
Usually switch - switch connections are configured as tagged. A port can be configured as a
tagged port in multiple VLANs. This means that VLANs are not restricted to individual switches,
but can also be operated across multiple switches.

Untagged: Ports that are stored as untagged in a VLAN can receive and forward packets of this
VLAN ID. A port can be stored as an untagged port in multiple VLANs if the devices connected to
this port shall communicate with multiple VLANs.

PVID: Only one PVID can be assigned to each port. The PVID determines to which switch-
internal VLAN group the incoming packet is assigned. The VLAN tag of the packet header is not
yet changed by this. Only when the packet leaves the switch via a tagged port is the VLAN tag
entered according to the PVID of the incoming port.
Global you can define: