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Foundry NetIron M2404C and M2404F Metro Access Switches Configuring VLANs (Rev.03)
Virtual LANs
© 2008 Foundry Networks, Inc.
Page 8 of 73
Figure 4: Ethernet Packet Encapsulation
When the device detects ingress traffic that contains 802.1p prioritization information, it maps
traffic to various hardware queues on its egress port. The transmitting hardware queue determines
the bandwidth management and priority characteristics used when transmitting packets.
NOTE
The device does not change the VLAN Priority Tag (VPT) for a switched packet
that comes with an 802.1Q tag, since it assumes that the sender of the packet has
already determined the VPT.
Packets received without a tag have their VPT set in by the
qos priority
command.
For more information about the 802.1p priority refer to “
Configuring Quality of Service (QoS)
”.