CHAPTER 6: OPERATIONAL GUIDE
OPERATIONAL GUIDE
MULTINET4 MULTI-PORT SERIAL SERVER & MANAGED SWITCH – INSTRUCTION MANUAL
6–3
sourced by the Multinet4 management process) it is compared with the configured filters.
If a match is found, the codepoint associated with that filter is applied to the packet. This
codepoint overrides any codepoint that was applied by an application (e.g. the DiffServ
marking applied by the terminal server process).
6.1.3.1 DiffServ Processing
The system can optionally be configured to assign packets to priority queues based on
their DiffServ marking. If a packet is received that has an unknown marking (i.e. one that is
not explicitly configured and mapped to a priority), the packet is treated as if it were
marked as Best Effort. The mapping of DiffServ markings to priority queues is configurable
by the user.
Packets generated by Multinet4 are always assigned a priority based on their DiffServ
marking.
6.1.3.2 DiffServ-to-802.1p Mapping
When an IP packet is generated by the Multinet4, the DiffServ marking may optionally be
used to map to an ethernet 802.1p priority. The mapping between DiffServ codepoints and
802.1p priorities is configurable by the user.
6.1.3.3 802.1p-to-priority queue Mapping
All ethernet frames processed by the switch may optionally be assigned to a priority queue
based on the frame's 802.1p priority. Whether or not the 802.1p priority is used for
mapping and the mapping of priorities to queues is configurable by the user.