Specifications
Alcatel-Lucent
OS-LS6200 Series Page 16
Availability Features
Key High Availability Features Supported
• IEEE 802.1w rapid recovery spanning tree allows sub-second failover to redundant link
• IEEE 802.1d spanning tree for loop free topology and link redundancy
• IEEE 802.1s multiple spanning tree
• Fast-forwarding mode on user ports to bypass 30-second delay for spanning tree
• Static and 802.3ad dynamic link aggregation that supports automatic configuration of link
aggregates with other switches.
• Broadcast Storm Control
• Redundant 1:1 power 4.4.5
• Redundant Management & Fabric (in a stacking configuration)
• Stacking (up to 8 units)
• Fault tolerant loop stack topology
• Optional DC power based OS LS 6200 chassis (non-PoE models only)
Power Supplies
1:1 backup power
The OmniStack LS 6200 supports one AC-to-DC power supply for primary power and one optional 2
nd
AC-to-DC or DC-to-DC power supply for backup (N+1 backup hot-swappable & hot insertable
optional backup power supply).
The Backup Power System—OS-LS-OS6200-BPS
Optional DC power based OS6200 chassis (non-PoE models only)
Fans The following models support three fixed fans:
• OS-LS-6248 = Fans
• OS-LS-6212P = Fans
• OS-LS-6224P = Fans
• OS-LS-6248P = Fans
• OS-LS-6224U = Fans
The following models use a fan less design:
• OS-LS-6212 = Fan less
• OS-LS-6224 = Fan less
Stacking Topology & Redundancy Fault tolerant loop stack topology
The devices operate in a Ring topology. A stacked Ring topology is where all devices (up to eight
units) in the stack are connected to each other forming a circle. Each device in the stack accepts data
and sends it to the device to which it is attached. The packet continues through the stack until it reaches
its destination. The system discovers the optimal path on which to send traffic.
Management & Fabric Redundancy In a stacking configuration, one unit acts as a Master proving the main management and fabric
switching functionality, while a 2
nd
unit acts as a backup.
Source learning and Spanning Tree Protocol (STP)
802.1d Spanning tree is a standard Layer 2 switch
requirement that allows bridges to automatically
prevent and resolve L2 forwarding loops. Switches
exchange configuration messages using specifically
formatted frames and selectively enable and disable
forwarding on ports. It is possible to configure BPDU
packets to be flooded, filtered or bridged when STP is
enabled.
Source Learning is responsible for creating, updating, and deleting source and destination MAC
Address entries in the MAC Address Table.
Spanning Tree:
• Support of single STP (IEEE 802.1D). The initial convergence time is 45 sec and
reconvergence time is also 45 sec per IEEE 802.1D standard
• PortFast: Fast-forwarding mode is also supported (proprietary mechanism): Fast
forwarding mode on user ports to bypass 30 second delay for Spanning Tree
• IEEE 802.1w Rapid Reconfiguration is supported. The initial convergence time is 45 sec
and the reconvergence time is less than 1sec per IEEE 802.1w standard
• The wire-speed IEEE 802.1s: MSTP (802.1s) is an IEEE standard which allows several
VLANs to be mapped to a reduced number of spanning-tree instances. This is possible
since most networks do not need more than a few logical topologies. Each instance handles
multiple VLANs that have the same Layer 2 topology. IEEE 802.1s per VLAN per
Spanning Tree allows L2 load balancing on redundant L2 links (up to 32 MSTP instances
are supported)
BPDU bridging Mode / Spanning Tree BPDU Mode It is possible to configure BPDU packets to be flooded, filtered or bridged when STP is disabled.
Spanning Tree BPDU Mode: BPDU Mode can be set to allow BPDU packets to be flooded, filtered or
bridged when STP is disabled.
BPDU bridging BPDU bridging allows customer network BPDUs to be transparently bridged across 6200 provider
bridge. BPDU bridging can forward all types of BPDUs, including AOS 1x1 per vlan tagged BPDUs.
Fast Link STP can take up to 60 seconds to converge. During this time, STP detects possible loops, allowing
time for status changes to propagate and for relevant devices to respond. 30-60 seconds is considered
too long of a response time for many applications. The Fast Link option bypasses this delay, and can
be used in network topologies where forwarding loops do not occur.
IEEE 802.1w Rapid Spanning Tree Spanning Tree can take 60 seconds for a device to decide which ports are actively forwarding traffic.
Rapid Spanning Tree (RSTP) detects network topologies to enable faster convergence, without
creating forwarding loops.
IEEE 802.1s Multiple Spanning Tree Multiple Spanning Tree (MSTP) operation maps VLANs into STP instances. MSTP provides differing
load balancing scenario. Packets assigned to various VLANs are transmitted along different paths
within MSTP Regions (MST Regions). Regions are one or more MSTP bridges by which frames can
be transmitted. The standard lets administrators assign VLAN traffic to unique paths.