Extreme Networks EPICenter Software Installation Manual page 343

Under the root node the Component Tree displays all the STP domains identified by the EPICenter
server. The VLANs included in the domain are listed as subcomponents of the domain. The VLANs in
turn show the devices with ports that are members of the VLAN within the domain.
NOTE
Devices running earlier versions of ExtremeWare may also have Spanning Tree domains configured
and enabled, but the EPICenter server is unable to obtain information about these domains because
SNMP agent support for STP was added in version 6.2.2.
The information presented for each STP domain includes:
• Name: The name of the STP domain.
• Tag: The 802.1Q tag of one of the wholly-contained VLANs in the domain.
• Root: The device name, IP address, or MAC address of the device configured as the designated root
of this STP domain. If STP is disabled for this domain, this field is blank.
• Root Max Age: The maximum allowable age for STP information learned by the root for this
domain. If this age is reached, the current information is discarded and the Spanning Tree is
recalculated. Value is in seconds.
• Root Hello Time: The interval between transmission of Configuration BPDUs by the root for this
domain. Value is in seconds.
• Root Forward Delay: The forward delay time being used by the root for this domain. The forward
delay is the time that a bridge remains in the learning and listening states, not forwarding data.
Value is in seconds.
• VLANs: The number of VLANs participating in this domain.
• Devices: The number of devices participating in this domain.
• Ports: The total number of ports participating in this domain, if the domain is enabled.
NOTE
If an untagged STP domain spans multiple switches and is configured with different tags on different
switches, it may appear as separate STP domains in EPICenter's STP Monitor.
EPICenter Software Installation and User Guide
Displaying STP Domain Information
343