Cisco Systems SLM248G4PS, SLM224G4PS manual Spanning Tree STP Port Settings, Bridge Settings

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Chapter 5

Configuration Using the Web-based Utility

Bridge Settings

Priority  Specifies the bridge priority value. When switches or bridges are running STP, each is assigned a priority. After exchanging BPDUs, the device with the lowest priority value becomes the Root Bridge. The default value is 32768. The value must be a multiple of 4096. For example, 4096, 8192, 12288, etc. The range is 0 to 65535.

HelloTime  Specifies the device HelloTime (the amount of time in seconds a root bridge waits between configuration messages). The default is 2 seconds. The range is 1 to 10 seconds.

Max Age  Specifies the device Maximum Age Time (the amount of time in seconds that a bridge waits before sending configuration messages). The default is 20 seconds. The range is 6 to 40 seconds.

Forward Delay  Specifies the device forward delay time (the amount of time in seconds a bridge remains in a listening and learning state before forwarding packets). The default is 15 seconds. The range is 4 to 30 seconds.

Choose settings for the Hello Time, Max Age, and Forward Delay parameters so that both of the following are true:

Max Age ≥ 2 × (Hello Time + 1)

2 × (Forward Delay – 1) ≥ Max Age

Click Save Settings to save the changes, or Cancel Changes to cancel the changes.

Spanning Tree > STP Port Settings

The STP Port Settings screen allows network administrators to assign STP settings to specific interfaces.

Spanning Tree > STP Port Settings

Interface  Indicates the port or LAG on which STP is enabled. Select either Port (default) or LAG, then select the interface from the drop-down menu.

Enable STP  Select this to enable STP on the port. The default is Enabled.

Port Fast  Indicates if Fast Link is enabled on the port. If Fast Link mode is enabled for a port, the Port State is automatically placed in the Forwarding state when the port link is up. Fast Link optimizes the STP protocol convergence. STP convergence can take 30-60 seconds in large networks. The possible values are Enable, Auto, and Disable. The default is Disable.

Port State  Displays the current STP state of a port. If enabled, the port state determines what forwarding action is taken on traffic. Possible port states are:

Disabled  STP is currently disabled on the port. The port forwards traffic while learning MAC addresses.

Blocking  The port is currently blocked and cannot forward traffic or learn MAC addresses.

Listening  The port is in Listening mode. The port cannot forward traffic nor can it learn MAC addresses.

Learning  The port is in Learning mode. The port cannot forward traffic, but can learn new MAC addresses.

Forwarding  The port is in Forwarding mode. The port can forward traffic and learn new MAC addresses.

Speed  Displays the speed at which the port is operating.

Path Cost  Indicates the port contribution to the root path cost. The path cost is adjusted to a higher or lower value, and is used to forward traffic when a path being rerouted. The default value is 2000000 for a 10M port, 200000 for a 100M port, and 20000 for a 1G port or a LAG.

Default Path Cost  When selected the default path cost is implemented. The default is unselected.

Priority  Priority value of the port. This value influences the port choice when a bridge has two ports connected in a loop. The range of values is 0 -240. The default is 128.

Designated Bridge ID  Displays the bridge priority and the MAC Address of the designated bridge.

Designated Port ID  Displays the selected port’s priority and interface.

Designated Cost  Displays the cost of the port participating in the STP topology. Ports with a lower cost are less likely to be blocked if STP detects loops.

Forward Transitions  Displays the number of times the port has changed from the Blocking state to Forwarding state.

Click Update to update the screen with your changes.

Click Save Settings to save the changes, or Cancel Changes to cancel the changes.

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Contents Port or 48-Port 10/100 + Online Resources About This GuideAbout This Guide Icon DescriptionsTable of Contents Snmp Global Parameters Snmp Views Snmp Group Profile SnmpGigabit Ethernet Fiber Optic Cabling Appendix B About Switch StackingAppendix G Contact Information Appendix C Glossary Appendix D SpecificationsIntroduction ChapterFront Panel Switch LEDs and ports are located on the front panelChapter Product Overview Product OverviewSwitch’s LEDs and ports are located on the front panel Power The Power port is where you connect the AC powerBack Panel Product Overview Placement Options Chapter InstallationInstallation Pre-Installation ConsiderationsDesktop Placement Hardware InstallationRack-Mount Placement Configuring Stack Mode Uplinking the SwitchTo set up a stack with six switches, follow these steps Connect port G1 on Unit 2 to port G2 on Unit Power off the new unit 5 the former master unitConnect port G1 on Unit 3 to port G2 on Unit Using telnet Chapter Configuration Using Console InterfaceLogin screen appears. Proceed to the Login section below System Configuration Menu How to Use the Console InterfaceLogin Switch Main MenuSystem Information Management SettingsSecurity Settings User & Password SettingsIP Configuration Http File Management Restore System Default SettingsReboot System Stack ConfigurationPort Status Menu Port ConfigurationLogout System ModePoE Settings HelpDevice Information Chapter Configuration Using Web-based UtilitySetup Setup SummaryClicking on a port displays the Port Configuration screen Setup ZoomSetup Network Settings Orange The administrator has closed down this portDaylight Saving Setup TimeSet Time Local TimeSntp Servers Setup Stack ManagementPort Management Port Settings Port ManagementPort Management Port Settings Port Configuration Port Management Link Aggregation LAG ConfigurationPort Management Lacp Port Management PoE Power SettingsVlan Table Vlan Management Port SettingVlan Management Vlan Management Create VlanVlan Management Vlan to Port Vlan Management Port to VlanJoin Vlan to Port Statistics Rmon Statistics StatisticsStatistics Rmon History Log Table Rmon HistoryRmon History Table Add Alarm Statistics Rmon AlarmsAlarm Table Statistics Port Utilization Statistics Rmon EventsStatistics Interface Statistics Parameters Security 802.1x SettingsSecurity Ethernet-likeSecurity Port Security Setting TimerSecurity Storm Control Security Management Access ListSecurity Radius QoSBroadcast Only Counts only Broadcast traffic CoS Default QoS CoS SettingsQoS Queue Settings CoS SettingsQoS Basic Mode QoS Dscp SettingsQoS Bandwidth Spanning Tree Global STP Global SettingSpanning Tree Spanning Tree STP StatusBridge Settings Spanning Tree STP Port SettingsSpeed Displays the speed at which the port is operating Multicast Bridge Multicast Vlan Igmp SettingsMulticast Multicast Igmp SnoopingSnmp Global Parameters Multicast Bridge Multicast Forward AllSnmp Group Profile Snmp ViewsSnmp Communities Snmp Group MembershipUser Name Provides a user-defined local user list Advanced Table Snmp Notification FilterSnmp Notification Recipient Base TableLocal User Edit AdminAdmin User Authentication User AuthenticationAdmin Dynamic Address Admin Static AddressSecure The entry is defined for locked ports Clear Table If selected, this clears the MAC Address table Admin Port MirroringAdmin Cable Test QueryAdmin Save Configuration Admin Reboot Admin Firmware UpgradeAdmin Factory Default Admin Server Logs Admin LoggingAdmin Memory Logs Logout Admin Flash LogsFiber Optic Cabling Appendix aAppendix a About Gigabit Ethernet Fiber Optic Cabling Gigabit EthernetStack Building Quick Start Appendix B About Switch StackingAbout Switch Stacking Appendix BUnit ID Allocation Advanced StackingStack Resiliency Unit IDsMaster Discovery Stack Units Startup ProcessMaster Election Replacing a Failed Stack Member in a Running Stack Unit and Port ConfigurationUser Controls Stacking ExamplesStack Master Failure and Replacement Splitting a Stack Subgroup Contains Both Master Unit and Backup Master UnitBoth Stacks Kept Running During Insertion Merging Two StacksInserting Too Many Units Stacking Cable FailureAppendix C Glossary Appendix CGlossary Glossary Mail protocol on the Internet Packet a unit of data sent over a networkAppendix C Specifications Appendix D SpecificationsAppendix D Management Vlan Class of Service Port-based 802.1p Vlan priority-basedPower in compliance with Ieee DimensionsExclusions and Limitations Warranty InformationObtaining Warranty Service Appendix ETechnical Support Warranty InformationRegulatory Information Appendix FRegulatory Information Appendix F Norsk Norwegian Miljøinformasjon for kunder i EU Appendix F Contact Information Appendix G