Cisco ONS 15454 SDH Specifications Page 389

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Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Chapter 9 Ethernet Operation
E Series Spanning Tree (IEEE 802.1D)
At the node view, click the Maintenance > Etherbridge > Spanning Trees tabs to view spanning tree
parameters.
9.7.3 E Series Spanning Tree Configuration
To view the spanning tree configuration, at the node view click the Provisioning > Etherbridge tabs.
9.7.4 E Series Spanning Tree Map
The Circuit screen shows forwarding spans and blocked spans on the spanning tree map.
Procedure: View the E Series Spanning Tree Map
Step 1 On the circuit screen (Figure 9-35), double-click an Ethernet circuit.
Table 9-7 Spanning Tree Parameters
BridgeID ONS 15454 SDH unique identifier that transmits the configuration bridge
protocol data unit (BPDU); the bridge ID is a combination of the bridge priority
and the ONS 15454 SDH MAC address
TopoAge Amount of time in seconds since the last topology change
TopoChanges Number of times the spanning tree topology has been changed since the node
booted up
DesignatedRoot Identifies the spanning trees designated root for a particular spanning tree
instance
RootCost Identifies the total path cost to the designated root
RootPort Port used to reach the root
MaxAge Maximum time that received-protocol information is retained before it is
discarded
HelloTime Time interval, in seconds, between the transmission of configuration BPDUs by
a bridge that is the spanning tree root or is attempting to become the spanning
tree root
HoldTime Minimum time period, in seconds, that elapses during the transmission of
configuration information on a given port
ForwardDelay Time spent by a port in the listening state and the learning state
Table 9-8 Spanning Tree Configuration
Column Default Value Value Range
Priority 32768 0 - 65535
Bridge max age 20 seconds 6 - 40 seconds
Bridge Hello Time 2 seconds 1 - 10 seconds
Bridge Forward Delay 15 seconds 4 - 30 seconds
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