Cisco CX-FEIP-2TX= Installation and con?guration Specifications Page 381

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9-41
Cisco ONS 15454 Installation and Operations Guide, R3.2
March 2002
Chapter 9 Ethernet Operation
E Series Spanning Tree (IEEE 802.1D)
9.7.1 E Series Multi-Instance Spanning Tree and VLANs
The ONS 15454 can operate multiple instances of STP to support VLANs in a looped topology. You can
dedicate separate circuits across the SONET ring for different VLAN groups (i.e., one for private TLS
services and one for Internet access). Each circuit runs its own STP to maintain VLAN connectivity in
a multi-ring environment.
Procedure: Enable E Series Spanning Tree on Ethernet Ports
Step 1 Display the CTC card view.
Step 2 Click the Provisioning > Port tabs.
Step 3 In the left-hand column, find the applicable port number and check the Stp Enabled checkbox to enable
STP for that port.
Step 4 Click Apply.
9.7.2 E Series Spanning Tree Parameters
Default spanning tree parameters are appropriate for most situations. Contact the Cisco Technical
Assistance Center (TAC) at 1-877-323-7368 before you change the default STP parameters.
At the node view, click the Maintenance > Etherbridge > Spanning Trees tabs to view spanning tree
parameters.
Table 9-9 Spanning Tree Parameters
BridgeID ONS 15454 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 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
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