Cisco 15327 - Manual (Page 403)

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Ethernet Card Software Feature and Configuration Guide, R7.2
Chapter 23 E-Series and G-Series Ethernet Operation
E-Series Circuit Configurations
E-Series Spanning Tree Configuration
To view the spanning tree configuration, at the node view click the Provisioning > Etherbridge >
Spanning Trees tabs (
Table 23-5 ).
E-Series Circuit Configurations
E-Series Ethernet circuits can link ONS nodes through point-to-point (straight), shared packet ring, or
hub-and-spoke configurations. Two nodes usually connect with a point-to-point configuration. More
than two nodes usually connect with a shared packet ring configuration or a hub-and-spoke
configuration. Ethernet manual cross-connects allow you to cross connect individual Ethernet circuits to
an STS/VC channel on the ONS node optical interface and also to bridge non-ONS SONET/SDH
network segments. To configure E-Series circuits, refer to the Cisco ONS 15454 Procedure Guide, the
Cisco ONS 15454 SDH Procedure Guide, or the Cisco ONS 15327 Procedure Guide.
Table 23-4 Spanning Tree Parameters
Parameter Description
BridgeID ONS node unique identifier that transmits the configuration bridge protocol data
unit (BPDU); the bridge ID is a combination of the bridge priority and the ONS
node MAC address.
TopoAge Amount of time in seconds since the last topology change.
TopoChanges Number of times the STP topology has been changed since the node booted up.
DesignatedRoot Identifies the STP’s designated root for a particular STP 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 23-5 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