Brocade Mobility RFS Controller System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 418)

406 Brocade Mobility RFS Controller System Reference Guide
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8. Define the following Switching Mode parameters to apply to the port channel configuration:
9. Select OK to save the changes made to the port channel Basic Configuration. Select Reset to
revert to the last saved configuration.
10. Select the Security tab.
Mode Select either the Access or Trunk radio button to set the VLAN switching mode over the port channel. If
Access is selected, the port channel accepts packets only form the native VLANs. Frames are forwarded
out the port untagged with no 802.1Q header. All frames received on the port are expected as
untagged and are mapped to the native VLAN. If the mode is set to Trunk, the port channel allows
packets from a list of VLANs you add to the trunk. A port channel configured as Trunk supports multiple
802.1Q tagged VLANs and one Native VLAN which can be tagged or untagged. Access is the default
setting.
Native VLAN Use the spinner control to define a numerical ID between 1 - 4094. The native VLAN allows an Ethernet
device to associate untagged frames to a VLAN when no 802.1Q frame is included in the frame.
Additionally, the native VLAN is the VLAN which untagged traffic will be directed over when using trunk
mode. The default value is 1.
Tag the Native VLAN Select the checkbox to tag the native VLAN. Brocade devices support the IEEE 802.1Q specification for
tagging frames and coordinating VLANs between devices. IEEE 802.1Q adds four bytes to each frame
identifying the VLAN ID for upstream devices that the frame belongs. If the upstream Ethernet device
does not support IEEE 802.1Q tagging, it does not interpret the tagged frames. When VLAN tagging is
required between devices, both devices must support tagging and be configured to accept tagged
VLANs. When a frame is tagged, the 12 bit frame VLAN ID is added to the 802.1Q header so upstream
Ethernet devices know which VLAN ID the frame belongs to. The device reads the 12 bit VLAN ID and
forwards the frame to the appropriate VLAN. When a frame is received with no 802.1Q header, the
upstream device classifies the frame using the default or native VLAN assigned to the Trunk port. The
native VLAN allows an Ethernet device to associate untagged frames to a VLAN when no 802.1Q frame
is included in the frame. This setting is disabled by default.
Allowed VLANs Selecting Trunk as the mode enables the Allowed VLANs parameter. Add VLANs that exclusively send
packets over the port channel.