Introduction and Specifications
SpectraComm IP Overview
076R200-000
SpectraComm IP T1 Router Card
1-9
Issue 13
Installation and Operation Manual
SCIP with Spanning Tree
SCIP in LAN-X mode supports IEEE 802.1D Spanning Tree Protocol. Using Spanning tree
protocol (STP) provides the following benefits:
•
Eliminates Loops: Spanning Tree Protocol determines the active topology of a bridged LAN so
that there is no more than one active data path between any two workstations in that bridged
LAN. The chosen data path for each LAN segment shall have at least Root Path Cost.
•
Provides Fault Tolerance: Spanning Tree Protocol automatically reconfigures the active
topology of a bridged LAN when there is a breakdown in the active data path. The chosen data
path for each LAN segment shall have at least Root Path Cost.
demonstrates the optimal root path determined by the Spanning Tree Protocol. No IP
addressing is needed since in LAN-X mode the SCIP devices are in a flat network. In the figure,
PC
denotes Port Costs and
BPri
denotes Bridge Priority.
Note
Spanning Tree Protocol changes the active topology in response to a newly detected path with a lower Root
Path Cost, which can be due to intentional operator actions, such as modification of Port Path Costs,
disabling or enabling ports, and attaching or removing a bridge device.
Note
Note that all bridges must be enabled to derive the optimal benefit of spanning tree.
Consult the IEEE 802.1D standard to learn more about STP.
Figure 1-4
Spanning Tree Protocol Diagram
LAN "A"
PC
488
PC
100
LAN "B"
LAN "C"
S0
E0
MAC 0001.96FD.83E1
B.PRI 32768
PC
100
PC
651
E0
S2
MAC 0010.7B86.12E2
B.PRI 32768
ROUTER
ROUTER
PC
19
PC
500
E0
S0
General
DataComm
SCIP-T1 #1
PC
500
PC
19
S0
E0
General
DataComm
SCIP-T1 #2
PC
100
PC
500
E0
S0
General
DataComm
SCIP-T1 #5
PC
500
PC
19
S0
E0
General
DataComm
SCIP-T1 #6
PC
100
PC
500
E0
S0
General
DataComm
SCIP-T1 #3
PC
500
PC
100
S0
E0
General
DataComm
SCIP-T1 #4
ROOT
BLOCKED
PORT
BLOCKED
PORT
MAC 00C0.6402.004D
B.PRI 32768
MAC 00C0.6402.004F
B.PRI 32768
MAC 00C0.6402.004C
B.PRI 20000
MAC 00C0.6402.0052
B.PRI 32768
MAC 00C0.6402.0050
B.PRI 32768
MAC 00C0.6402.004E
B.PRI 32768
Содержание SpectraComm IP T1
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