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Configuring STP and RSTP
5-10 Configuring Spanning Trees
Setting a Port Priority
Youcansetaspanningtreepriorityforaport,whichwillbeusedtobreakthetiewhentwo
bridgestieforpositionastherootbridge.Thebridgewiththelowestportvaluewillbeelected.
Tosetaportpriority:
set spantree portpri port-string priority [sid sid]
Validpriorityvaluesare0‐240(inincrementsof16)with0indicatinghighpriority.
Validsidvaluesare0‐4094.Ifnotspecified,SID0willbeassumed.
Assigning Port Costs
Eachinterfacehasaspanningtreeportcostassociatedwithit,whichhelpstodeterminethe
quickestpathbetweentherootbridgeandaspecifieddestination.Byconvention,thehigherthe
portspeed,thelowertheportcost.Bydefault,thisvalueissetto0,whichforcestheportto
recalculatespanningtreeportcostbasedonthespeedoftheportandwhetherornotlegacy
(802.1D)pathcostisenabled.
Toassigndifferentspanningtreeportcosts:
set spantree adminpathcost port-string cost [sid sid]
Va1idcostvaluesare:
– 0‐65535iflegacypathcostisenabled.
– 0‐200000000iflegacypathcostisdisabled.
Validsidvaluesare0‐4094.Ifnotspecified,SID0willbeassumed.
Adjusting Bridge Protocol Data Unit (BPDU) Intervals
UsethecommandsinthissectiontoadjustthefollowingdefaultBPDUintervalvalues.
Notes: By default, legacy path cost is disabled. Enabling the device to calculate legacy path costs
affects the range of valid values that can be administratively assigned.
To check the status of legacy path cost, use show spantree legacypathcost.
To disable legacy path cost, if necessary use set spantree legacypathcost disable.
BPDU Interval Default Value
Hello time (bridge and ports) 2 seconds
Forward delay 15 seconds
Maximum age time 20 seconds
- Matrix DFE Series and N-SA 1
- User’s Guide 1
- Enterasys Networks, Inc 4
- Firmware License Agreement 4
- Contents 7
- Chapter 6: Managing Syslog 9
- Chapter 7: Configuring IP 9
- Chapter 8: Configuring OSPF 10
- Chapter 9: Configuring VRRP 10
- Procedures 12
- Features Overview 13
- Factory Default Settings 14
- 1-2 Features Overview 14
- 1-4 Features Overview 16
- No value applied 17
- Device Management Methods 18
- Getting Started 19
- 2-2 Getting Started 20
- Using a Telnet Connection 21
- Setting System Passwords 22
- Setting Syslog Parameters 23
- 2-6 Getting Started 24
- ]: download 28
- ]: setboot myimage 29
- Resetting the Device 30
- Activating Licensed Features 31
- Using WebView 32
- Using the CLI 33
- Creating Strong Passwords 34
- Setting New System Passwords 36
- Setting Password Policies 38
- Enabling or Disabling Telnet 39
- About Host Keys 40
- Setting CLI Parameters 41
- Displaying Scrolling Screens 42
- Using Context-Sensitive Help 42
- Performing Keyword Lookups 43
- Abbreviating a Command 44
- Console Ports 45
- Switch Ports 46
- Designating Ports in the CLI 46
- 3-16 Using the CLI 48
- 3-18 Using the CLI 50
- 3-20 Using the CLI 52
- Configuring Link Aggregation 53
- LACP Operation 54
- LACP Terminology 54
- Reviewing the Configuration 56
- Configuring Spanning Trees 61
- N‐SAdevice. 62
- Term Definition 62
- Spanning Tree (IEEE 802.1D) 63
- MST Region 64
- Physical Link 66
- Blocked VLANs 66
- Spanning Tree Port States 67
- Configuring STP and RSTP 68
- Setting the Bridge Priority 69
- Setting a Port Priority 70
- Assigning Port Costs 70
- Adjusting Port Hello Times 71
- Adjusting RSTP Parameters 72
- Defining Point-to-Point Links 73
- Defining Edge Port Status 73
- Configuring MSTP 74
- Adjusting MSTP Parameters 75
- Monitoring MSTP 75
- Configuring Spanguard 76
- Managing Syslog 79
- Interpreting Messages 80
- Enabling Syslog Server(s) 82
- Modifying default settings 83
- 6-6 Managing Syslog 84
- Displaying a log file 85
- 6-8 Managing Syslog 86
- Configuring IP 87
- Example Scenario 88
- 7-4 Configuring IP 90
- 7-6 Configuring IP 92
- Assigning an IP Address 93
- Sample Configuration 94
- 7-10 Configuring IP 96
- Displaying the ARP Table 98
- Changing the ARP Timeout 100
- Clearing the ARP Cache 100
- Enabling DHCP/BOOTP Relay 102
- Examples 103
- Configuring ICMP 104
- Using Traceroute 105
- 7-20 Configuring IP 106
- Configuring OSPF 107
- OSPF Terminology 108
- Supported Functions 108
- OSPF Overview 109
- OSPF Areas 110
- Static Multipath Forwarding 111
- Designating an OSPF Instance 111
- Virtual Links 111
- 8-6 Configuring OSPF 112
- 8-8 Configuring OSPF 114
- Activating Advanced Routing 115
- 8-10 Configuring OSPF 116
- Configuring an OSPF NSSA 117
- 8-12 Configuring OSPF 118
- Displaying OSPF Information 119
- Limiting Database Overflow 119
- Resetting OSPF 120
- Debugging OSPF 120
- Configuring VRRP 121
- Basic VRRP Configuration 123
- Router R2 Configuration 124
- Symmetrical Configuration 125
- Router R1 Configuration 126
- Multi-Backup Configuration 128
- 10.0.0.1/16 129
- 10.0.0.2/16 129
- 10.0.0.3/16 129
- 9-10 Configuring VRRP 130
- Router R3 Configuration 132
- Modifying a Configuration 134
- Setting a Critical IP Address 135
- Setting Pre-empt Mode 135
- Setting an Authentication Key 136
- Monitoring VRRP 137
- VRRP Configuration Notes 137
- 9-18 Configuring VRRP 138
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