Alcatel-Lucent 9500 MXC, User Manual, Page: 158 / 916

Chapter 3. 9500 MXC Nodes
Vol. II-3-64 Alcatel-Lucent
RWPR
DAC GE incorporates RSTP in the form of RWPR-enhanced RSTP.
RWPR
TM
(Resilient Wireless Packet Ring) employs a patent-pending
rapid-transport-channel failure detection (RFD) mechanism to enhance the
built-in DAC GE RSTP capability. RFD accelerates the normal processes used to
achieve RSTP switching on an Ethernet ring/mesh to bring typical service
restoration or re-convergence times of 2 to 5 seconds down to as low as 50 ms.
Two or more channels/ports are enabled as RSTP bridge ports, the bridge is
assigned a priority, and each port is assigned a cost and a priority to assist RSTP
election of a root switch, and root and alternate ports.
For more information on RWPR settings refer to DAC GE Configuration,
Volume IV, Chapter 7.
VLAN Tagging
DAC GE supports 802.1q tagging with menus for selection of VLAN tagging
modes, and priority settings for tagged-traffic. Diagrams assist understanding of
the tagging action for each mode.
The tagging options are Do Nothing, Q-in-Q, or 802.1q. Selections are made on a
per-port basis.
• With Q-in-Q, frames with existing tags are tagged (double tagged).
• With 802.1q untagged frames are tagged.
• The tagging options of Q-in-Q and 802.1q are only available for Transparent
mode and on ports P2 to P4 for Mixed mode. Do Nothing is fixed for VLAN
mode and for P1 of Mixed mode
A VLAN ID can be entered (range 0 to 4095) or left as default.
A VLAN membership filter is also provided. Only VLAN IDs within the
membership range are allowed to transit the relevant port/channel.
With this VLAN tagging capability, DAC GE can tag, 802.1p prioritize, and
aggregate LAN traffic from two, three or four ports onto a common trunk/
channel. At the far end of the DAC GE trunk, which may be over multiple hops,
the options are to remove the VLAN tags applied by DAC GE, or allow them to
be retained intact for VLAN traffic management at downstream devices.
Ethernet Diagnostics
CT diagnostics screens capture Ethernet performance and history. The data for
DAC GE includes:
• Port/channel status.
• Configured capacities.
• Graphed current Rx and Tx throughputs and discards per port and channel.