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Cisco ONS 15454 SDH Procedure Guide, R7.0
78-17194-01
Chapter 6 Create Circuits and Low-Order Tunnels
NTP- D191 Create an E-Series EtherSwitch Circuit (Multicard or Single-Card Mode)
• Topology Host—Choose the topology host ID from the drop-down list.
Step 19 Click OK.
Step 20 In the Circuit VLAN Selection area, highlight the VLAN name and click the arrow button (>>) to move
the available VLANs to the Circuit VLANs column.
Step 21 If you are building a single-card EtherSwitch circuit and want to disable spanning tree protection on this
circuit, uncheck the Enable Spanning Tree check box and click OK on the Disabling Spanning Tree
dialog box. The Enable Spanning Tree box remains checked or unchecked for the creation of the next
single-card, point-to-point Ethernet circuit.
Caution Disabling spanning tree protection increases the likelihood of logic loops on an Ethernet network.
Caution Turning off spanning tree on a circuit-by-circuit basis means that the ONS 15454 SDH is no longer
protecting the Ethernet circuit and that the circuit must be protected by another mechanism in the
Ethernet network.
Caution Multiple circuits with spanning tree protection enabled incur blocking if the circuits traverse the same
E-Series card and use the same VLAN.
Spanning tree rules prevent users from creating new circuits or modifying existing circuits if the circuits
do not meet certain VLAN assignment constraints. If the VLAN set of the new circuit overlaps with
existing circuits, the same spanning tree instance is used for all circuits. If the VLAN set of the new
circuit overlaps with VLAN sets of existing circuits with different spanning tree instances, the VLAN
assignment fails. Cisco recommends that you plan VLAN assignments so that circuits with larger VLAN
sets and a higher chance of overlap are added first. This means that if a circuit with an overlapping
VLAN set is added, it collapses into the same spanning tree. To view circuits mapped to a spanning tree
and their VLAN assignments, see the “DLP-D23 View Spanning Tree Information” task on page 17-19.
You can disable or enable spanning tree protection on a circuit-by-circuit basis only for single-card,
point-to-point Ethernet circuits. Other E-Series Ethernet configurations disable or enable spanning tree
on a port-by-port basis.
Step 22 Click Next.
Step 23 Confirm that the following information about the circuit is correct:
• Circuit name
• Circuit type
• Circuit size
• ONS 15454 SDH circuit nodes
Step 24 Click Finish.
Step 25 Complete the “DLP-D220 Provision E-Series Ethernet Ports” task on page 19-18.
Step 26 Complete the “DLP-D221 Provision E-Series Ethernet Ports for VLAN Membership” task on
page 19-19.
Step 27 Complete the “NTP-D146 Test E-Series Circuits” procedure on page 6-89.
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