Specifications

Alcatel-Lucent Page 17
OmniSwitch 6850 Series
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The Alcatel-Lucent AOS OmniSwitch product family has been designed from its inception to provide carrier-class availability to meet the needs of mission-
critical, IP Communications, and converged network environments. With the increasing importance of networks carrying voice and real-time applications, there
is an increased need for availability that reaches across the network links and end user devices. Additionally, there is also the need for high availability in the
areas of security and manageability, with intelligence and performance as integral parts of the network infrastructure to enable enterprises to achieve their
availability goals. A very cost effective, highly available, highly scalable and highly re-configurable network will be achieved when the OS6850 is deployed in
your LAN enterprise network. The following is only a highlight of the availability features supported by the OmniSwitch 6850 Series:
 Smart Continuous Switching: Hot Swap, Management Module Fail-over, Power Monitoring, Redundancy, and Stackability
 Redundancy support: redundant management, redundant fabric, and redundant power supply 4.3.3
 Hot swappable & hot insertable support: switch modules, MiniGBICs, and redundant power supply
 IEEE 802.1w rapid recovery spanning tree allows sub-second fail-over to redundant link
 IEEE 802.1d spanning tree for loop free topology and link redundancy
 IEEE 802.1s multiple spanning tree and Alcatel-Lucent per-VLAN spanning tree (1x1)
 Fast forwarding mode on user ports to bypass 30 second delay for spanning tree
 Static and IEEE 802.3ad dynamic link aggregation that supports automatic configuration of link aggregates with other switches.
 Broadcast storm control
 Redundant 1: 1 power provided by the Backup Power Supplies
 Redundant 1: 1 PoE power provided by the PoE Power Supplies
 BPDU blocking – automatically shuts down switch ports being used as user ports if a spanning tree BPDU packet is seen.
Prevents unauthorized spanning-tree enabled attached bridges from operating.
The Spanning Tree Algorithm and Protocol (STP) The Spanning Tree Algorithm and Protocol (STP) is a self-configuring algorithm that maintains a
loop-free topology while providing data path redundancy and network scalability. Based on the IEEE
802.1D standard, the Alcatel-Lucent STP implementation distributes the Spanning Tree load between
the primary switch management and the rest of the NI Modules. This ensures a Spanning Tree that
continues to respond to STP Bridge Protocol Data Units (BPDU) received on switch ports and port link
up and down states in the event of a primary switch management fail over to a secondary (backup)
switch management. In addition, the Alcatel-Lucent distributed implementation incorporates the
following Spanning Tree features:
• Configures a physical topology into a single Spanning Tree to ensure that there is only one
data path between any two switches.
• Supports fault tolerance within the network topology. The Spanning Tree is reconfigured in
the event of a data path or bridge failure or when a new switch is added to the topology.
• Supports two Spanning Tree operating modes: flat (single STP instance per switch) and 1x1
(single STP instance per VLAN).
• Supports three Spanning Tree Algorithms: 802.1D (standard STP) and 802.1w (RSTP), and
802.1s (MSTP).
• Allows 802.1Q tagged ports and link aggregate logical ports to participate in the calculation
of the STP topology.
• On the OmniSwitch 6850, the 802.1w Rapid Spanning Tree Algorithm and Protocol
(RSTP) is the default protocol enabled for a VLAN.
The Distributed Spanning Tree software is active on all switches by default. As a result, a loop-free
network topology is automatically calculated based on default Spanning Tree switch, VLAN, and port
parameter values. It is only necessary to configure Spanning Tree parameters to change how the
topology is calculated and maintained.
Spanning Tree Specifications:
IEEE Standards supported:
 802.1D–Media Access Control (MAC) Bridges
 802.1w–Rapid Reconfiguration (802.1D Amendment 2)
 802.1Q–Virtual Bridged Local Area Networks
 802.1s–Multiple Spanning Trees (802.1Q Amendment 3)
Spanning Tree Operating Modes supported:
 Flat mode - one spanning tree instance per switch
 1x1 mode - one spanning tree instance per VLAN
Spanning Tree Protocols supported:
 802.1D Standard Spanning Tree Algorithm and Protocol (STP)
 802.1w Rapid Spanning Tree Algorithm and Protocol (RSTP)
 802.1s Multiple Spanning Tree Protocol (MSTP)
Spanning Tree Port eligibility:
 Fixed ports (non-mobile)
 802.1Q tagged ports
 Link aggregate of ports
Maximum number of 1x1 Spanning Tree instances: 253
Number of Multiple Spanning Tree Instances (MSTI) supported: 16 MSTI, in addition to the Common
and Internal Spanning Tree instance (also referred to as MSTI 0).