User Guide
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All ports that are defi ned as members of the trunk group can be used for trunking
ONLY and cannot be used for other purposes, even when they are not being used
by the trunk group.
Cross-VLAN trunk grouping is not supported. All members of a trunk group must
be within the same VLAN. Otherwise the trunk will not function properly.
When the trunk group is used for inter-switch cascading (Uplinks), be sure the
cascading port used for connecting with the other switch is part of the corre-
sponding trunk group. The cascading of multiple ports (trunk members) must be
done from one trunk group to a corresponding trunk group.
CAUTION:
Never connect two trunk groups of a switch together or
cascade two switches through more than one trunk channel.
Such confi gurations will result in a network loop and will
cause a broadcast storm resulting in blocking of all network
traffi c on the switches.
5.8 QoS
QoS functions can be implemented through a combination of priority mode set-
tings and priority control options. The XMS-1008P supports packet mapping by 4
priority levels (low, normal, medium and high) and 3 priority setting modes: Type of
Service (ToS) Priority, 802.1P Tag Priority, and 802.1P Default Priority
QoS priority setting modes are in the following order from highest to lowest
1. ToS Priority
2. 802.1P Tag Priority
3. 802.1P Default Priority
4. Port Priority
If “ToS Priority” is enabled, the switch automatically reads an 8-bit ToS tag from
the IPv6/IPv4 packet. If the priority tag indicates a high priority, this packet is
mapped to high priority for priority processing. When the switch becomes busy,
it processes the packets marked with a high priority fi rst.
