Contents
vi
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
Bridge ID, Switch Priority, and Extended System ID 7-4
Spanning-Tree Timers 7-4
Creating the Spanning-Tree Topology 7-4
Spanning-Tree Interface States 7-5
Blocking State 7-6
Listening State 7-7
Learning State 7-7
Forwarding State 7-7
Disabled State 7-7
Spanning-Tree Address Management 7-8
STP and IEEE 802.1Q Trunks 7-8
Spanning Tree and Redundant Connectivity 7-8
Accelerated Aging to Retain Connectivity 7-9
RSTP 7-9
Supported RSTP Instances 7-9
Port Roles and the Active Topology 7-9
Rapid Convergence 7-11
Synchronization of Port Roles 7-12
Bridge Protocol Data Unit Format and Processing 7-13
Processing Superior BPDU Information 7-14
Processing Inferior BPDU Information 7-14
Topology Changes 7-14
Interoperability with IEEE 802.1D STP 7-15
Configuring STP and RSTP Features 7-15
Default STP and RSTP Configuration 7-16
Disabling STP and RSTP 7-16
Configuring the Root Switch 7-17
Configuring the Port Priority 7-17
Configuring the Path Cost 7-18
Configuring the Switch Priority of a Bridge Group 7-19
Configuring the Hello Time 7-19
Configuring the Forwarding-Delay Time for a Bridge Group 7-20
Configuring the Maximum-Aging Time for a Bridge Group 7-20
Verifying and Monitoring STP and RSTP Status 7-20
CHAPTER
8
Configuring VLANs 8-1
Understanding VLANs 8-1
Configuring IEEE 802.1Q VLAN Encapsulation 8-2
IEEE 802.1Q VLAN Configuration 8-3
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