Cisco ONS 15454 SDH Specifications Page 387

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9-41
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Chapter 9 Ethernet Operation
E Series Spanning Tree (IEEE 802.1D)
9.6.4 VLAN Counter
The ONS 15454 SDH displays the number of VLANs used by circuits and the total number of VLANs
available for use. To display the number of available VLANs and the number of VLANs used by circuits,
click the Circuits tab and click an existing Ethernet circuit to highlight it. Click Edit. Click the VLANs
tab.
Figure 9-33 Edit Circuit dialog featuring available VLANs
9.7 E Series Spanning Tree (IEEE 802.1D)
The Cisco ONS 15454 SDH operates spanning tree protocol (STP) according to IEEE 802.1D when an
Ethernet card is installed. STP operates over all packet-switched ports including Ethernet and SDH ports.
On Ethernet ports, STP is enabled by default but may be disabled with a check box under the
Provisioning > Port tabs at the card-level view. A user can also disable or enable spanning tree on a
circuit-by-circuit basis on unstitched Ethernet cards in a point-to-point configuration. However, turning
off spanning tree protection on a circuit-by-circuit basis means that the ONS 15454 system is not
protecting the Ethernet traffic on this circuit, and the Ethernet traffic must be protected by another
mechanism in the Ethernet network. On SDH interface ports, STP activates by default and cannot be
disabled.
The Ethernet card can enable STP on the Ethernet ports to allow redundant paths to the attached Ethernet
equipment. STP spans cards so that both equipment and facilities are protected against failure.
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