Brocade Mobility RFS Controller System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 126)

114 Brocade Mobility RFS Controller System Reference Guide
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10. Define or override the following Switching Mode parameters to apply to the VM Interface
configuration:
11. Select OK to save the changes and overrides to the VM interface basic configuration. Select
Reset to revert to the last saved configuration.
12. Select the Security tab.
Mode Select either the Access or Trunk radio button to set the VLAN switching mode over the VM interface. If
Access is selected, the VM interface accepts packets only from the native VLAN. Frames are forwarded
untagged with no 802.1Q header. All frames received on the VMIF port are expected as untagged and
are mapped to the native VLAN. If the mode is set to Trunk, the VM interface allows packets from a list
of VLANs you add to the trunk. A VM interface 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 Native VLAN ID from 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 untagged traffic will be directed over when using trunk
mode. The default value is 1.
Tag the Native VLAN Select this option to tag the native VLAN. Service platforms 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 VMIF that the frame belongs. If the upstream VMIF does not
support IEEE 802.1Q tagging, it does not interpret the tagged frames. When VLAN tagging is required
between VM interface ports, both VM interfaces must support tagging and be configured to accept
tagged VLANs. When a frame is tagged, a 12 bit frame VLAN ID is added to the 802.1Q header, so
upstream VM interfaces know which VLAN ID the frame belongs to. The 12 bit VLAN ID is read and the
frame is forwarded to the appropriate VLAN. When a frame is received with no 802.1Q header, the
upstream VMIF classifies the frame using the default or native VLAN assigned to the Trunk port. The
native VLAN allows a VM interface 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 VM interface. The available range is from 1 - 4094. The maximum number of entries is
256.