Specifications

System Overview Tsunami MP.11 5012/5054-SUI Installation and Management
Virtual Local Area Networks (VLANs)
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Mixed Mode
Mixed mode is available on both the SU and the BSU. It is used when the devices behind the SU send both tagged and
untagged data. Frames to and from the Ethernet interface behind the SU can be tagged or untagged.
Tagged frames received on the Ethernet interface are compared against the SU’s trunk table, and only packets whose
VLAN ID matches the trunk table are forwarded. All other packets are dropped. Untagged traffic is forwarded without any
restrictions. If the BSU is in Mixed mode, the SU can be in Trunk, Access, or Mixed mode.
Q-in-Q (VLAN Stacking)
The Q-in-Q mechanism allows Service Providers to maintain customer-assigned VLANs while avoiding interference with
the Service Providers’ VLANs. Using the Q-in-Q mechanism, an Outer VLAN ID and Priority are added to VLAN tagged
packets on top of the existing VLAN ID, such that interference is avoided and traffic is properly routed.
VLAN Forwarding
The VLAN Trunk mode provides a means to configure a list of VLAN IDs in a Trunk VLAN Table. The SU and BSU only
forward frames (between Ethernet and WORP interface) tagged with the VLAN IDs configured in the Trunk VLAN Table.
Up to 256 VLAN IDs can be configured for the BSU and up to 16 VLAN IDs can be configured for the SU (depending
upon the capabilities of your switching equipment).
VLAN Relaying
The VLAN Trunk mode for BSU operation provides an option to enable and disable a VLAN relaying flag; when enabled,
the BSU shall relay frames between SUs on the same BSU having the same VLAN ID.
Management VLAN
The BSU and SU allow the configuration of a separate VLAN ID and priority for SNMP, ICMP, Telnet, and TFTP
management frames for device access.
The management VLAN ID and management VLAN priority may be applied in any mode. The management stations tag
the management frames they send to the BSU or SU with the management VLAN ID configured in the device. The BSU
and SU tag all the management frames from the device with the configured management VLAN and priority.
BSU and SU in Transparent Mode
When the BSU is in Transparent mode, all associated SUs must be in Transparent mode.
How the BSU and SUs function in Transparent mode is described in the following table.