Spanning Tree Protocol 143 Configuring STP Timers NOTE: For the hello-time command, the range is 1 to 10 seconds. The default is 2 seconds. For the forward-time command, the range is 4 to 30 seconds. The default is 15 seconds. For the max-age command, the range is 6 to 40 seconds. The default is 20 seconds. CAUTION: Cisco recommends caution when using this command. Cisco further recommends that the spanning-tree vlan x root primary or the spanning-tree vlan x root secondary command be used instead to modify the switch timers. Verifying STP Switch(config)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee vv vv ll ll aa aa nn nn 55 55 hh hh ee ee ll ll ll ll oo oo tt tt ii ii mm mm ee ee 44 44 Changes the hello-delay timer to 4 seconds on VLAN 5 Switch(config)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee vv vv ll ll aa aa nn nn 55 55 ff ff oo oo rr rr ww ww aa aa rr rr dd dd tt tt ii ii mm mm ee ee 22 22 00 00 Changes the forward-delay timer to 20 seconds on VLAN 5 Switch(config)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee vv vv ll ll aa aa nn nn 55 55 mm mm aa aa xx xx aa aa gg gg ee ee 22 22 55 55 Changes the maximum-aging timer to 25 seconds on VLAN 5 Switch#ss ss hh hh oo oo ww ww ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee Displays STP information Switch#ss ss hh hh oo oo ww ww ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee aa aa cc cc tt tt ii ii vv vv ee ee Displays STP information on active interfaces only Switch#ss ss hh hh oo oo ww ww ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee bb bb rr rr ii ii ee ee ff ff Displays a brief status of the STP Switch#ss ss hh hh oo oo ww ww ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee dd dd ee ee tt tt aa aa ii ii ll ll Displays a detailed summary of interface information Switch#ss ss hh hh oo oo ww ww ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee ii ii nn nn tt tt ee ee rr rr ff ff aa aa cc cc ee ee gg gg ii ii gg gg aa aa bb bb ii ii tt tt ee ee tt tt hh hh ee ee rr rr nn nn ee ee tt tt 00 00 // // 11 11 Displays STP information for interface gigabitethernet 0/1 Switch#ss ss hh hh oo oo ww ww ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee ss ss uu uu mm mm mm mm aa aa rr rr yy yy Displays a summary of port states Switch#ss ss hh hh oo oo ww ww ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee ss ss uu uu mm mm mm mm aa aa rr rr yy yy tt tt oo oo tt tt aa aa ll ll ss ss Displays the total lines of the STP section Switch#ss ss hh hh oo oo ww ww ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee vv vv ll ll aa aa nn nn 55 55 Displays STP information for VLAN 5 144 Spanning Tree Protocol Optional STP Configurations Although the following commands are not mandatory for STP to work, you might find these helpful to fine-tune your network. PortFast BPDU Guard Switch(config)#ii ii nn nn tt tt ee ee rr rr ff ff aa aa cc cc ee ee ff ff aa aa ss ss tt tt ee ee tt tt hh hh ee ee rr rr nn nn ee ee tt tt 00 00 // // 11 11 00 00 Moves to interface configuration mode. Switch(config-if)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee pp pp oo oo rr rr tt tt ff ff aa aa ss ss tt tt Enables PortFast on an access port. Switch(config-if)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee pp pp oo oo rr rr tt tt ff ff aa aa ss ss tt tt tt tt rr rr uu uu nn nn kk kk Enables PortFast on a trunk port. WARNING: Use the portfast command only when connecting a single end station to an access or trunk port. Using this command on a port connected to a switch or hub could prevent spanning tree from detecting loops. NOTE: If you enable the voice VLAN feature, PortFast is enabled automatically. If you disable voice VLAN, PortFast is still enabled. Switch#ss ss hh hh oo oo ww ww ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee ii ii nn nn tt tt ee ee rr rr ff ff aa aa cc cc ee ee ff ff aa aa ss ss tt tt ee ee tt tt hh hh ee ee rr rr nn nn ee ee tt tt 00 00 // // 11 11 00 00 pp pp oo oo rr rr tt tt ff ff aa aa ss ss tt tt Displays PortFast information on interface fastethernet 0/10. Switch(config)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee pp pp oo oo rr rr tt tt ff ff aa aa ss ss tt tt bb bb pp pp dd dd uu uu gg gg uu uu aa aa rr rr dd dd dd dd ee ee ff ff aa aa uu uu ll ll tt tt Globally enables BPDU Guard. Switch(config)#ii ii nn nn tt tt ee ee rr rr ff ff aa aa cc cc ee ee rr rr aa aa nn nn gg gg ee ee ff ff aa aa ss ss tt tt ee ee tt tt hh hh ee ee rr rr nn nn ee ee tt tt 00 00 // // 11 11 –– –– 55 55 Enters interface range configuration mode. Switch(config-if- range)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee pp pp oo oo rr rr tt tt ff ff aa aa ss ss tt tt Enables PortFast on all interfaces in the range. NOTE: By default, BPDU Guard is disabled. Switch(config)#ee ee rr rr rr rr dd dd ii ii ss ss aa aa bb bb ll ll ee ee rr rr ee ee cc cc oo oo vv vv ee ee rr rr yy yy cc cc aa aa uu uu ss ss ee ee bb bb pp pp dd dd uu uu gg gg uu uu aa aa rr rr dd dd Allows port to reenable itself if the cause of the error is BPDU Guard by setting a recovery timer. Spanning Tree Protocol 145 Changing the Spanning-Tree Mode Different types of spanning tree can be configured on a Cisco switch. The options vary according to the platform: • Per-VLAN Spanning Tree (PVST)—There is one instance of spanning tree for each VLAN. This is a Cisco proprietary protocol. • Per-VLAN Spanning Tree Plus (PVST+)—Also Cisco proprietary. Has added extensions to the PVST protocol. • Rapid PVST+—This mode is the same as PVST+ except that it uses a rapid convergence based on the 802.1w standard. • Multiple Spanning Tree Protocol (MSTP)—IEEE 802.1s. Extends the 802.1w Rapid Spanning Tree (RST) algorithm to multiple spanning trees. Multiple VLANs can map to a single instance of RST. You cannot run MSTP and PVST at the same time. Switch(config)#ee ee rr rr rr rr dd dd ii ii ss ss aa aa bb bb ll ll ee ee rr rr ee ee cc cc oo oo vv vv ee ee rr rr yy yy ii ii nn nn tt tt ee ee rr rr vv vv aa aa ll ll 44 44 00 00 00 00 Sets recovery timer to 400 seconds. The default is 300 seconds. The range is from 30 to 86400 seconds. Switch#ss ss hh hh oo oo ww ww ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee ss ss uu uu mm mm mm mm aa aa rr rr yy yy tt tt oo oo tt tt aa aa ll ll ss ss Verifies whether BPDU Guard is enabled or disabled. Switch#ss ss hh hh oo oo ww ww ee ee rr rr rr rr dd dd ii ii ss ss aa aa bb bb ll ll ee ee rr rr ee ee cc cc oo oo vv vv ee ee rr rr yy yy Displays errdisable recovery timer information. Switch(config)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee mm mm oo oo dd dd ee ee mm mm ss ss tt tt Enables MSTP. This command is available only on a switch running the EI software image. Switch(config)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee mm mm oo oo dd dd ee ee pp pp vv vv ss ss tt tt Enables PVST. This is the default setting. Switch(config)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee mm mm oo oo dd dd ee ee rr rr aa aa pp pp ii ii dd dd pp pp vv vv ss ss tt tt Enables Rapid PVST+. 146 Spanning Tree Protocol Extended System ID Enabling Rapid Spanning Tree Switch(config)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee ee ee xx xx tt tt ee ee nn nn dd dd ss ss yy yy ss ss tt tt ee ee mm mm ii ii dd dd Enables extended system ID, also known as MAC address reduction. NOTE: Catalyst switches running software earlier than Cisco IOS Software Release 12.1(8) EA1 do not support the extended system ID. Switch#ss ss hh hh oo oo ww ww ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee ss ss uu uu mm mm mm mm aa aa rr rr yy yy Verifies extended system ID is enabled. Switch#ss ss hh hh oo oo ww ww rr rr uu uu nn nn nn nn ii ii nn nn gg gg cc cc oo oo nn nn ff ff ii ii gg gg Verifies extended system ID is enabled. Switch(config)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee mm mm oo oo dd dd ee ee rr rr aa aa pp pp ii ii dd dd pp pp vv vv ss ss tt tt Enables Rapid PVST+. Switch(config)#ii ii nn nn tt tt ee ee rr rr ff ff aa aa cc cc ee ee ff ff aa aa ss ss tt tt ee ee tt tt hh hh ee ee rr rr nn nn ee ee tt tt 00 00 // // 11 11 Moves to interface configuration mode. Switch(config-if)#ss ss pp pp aa aa nn nn nn nn ii ii ss ss nn nn gg gg tt tt rr rr ee ee ee ee ll ll ii ii nn nn kk kk tt tt yy yy pp pp ee ee pp pp oo oo ii ii nn nn tt tt tt tt oo oo pp pp oo oo ii ii nn nn tt tt Sets the interface to be a point-to-point interface. NOTE: By setting the link type to point to point, this means that if you connect this port to a remote port, and this port becomes a designated port, the switch negotiates with the remote port and transitions the local port to a forwarding state. Switch(config-if)#ee ee xx xx ii ii tt tt Switch(config)#cc cc ll ll ee ee aa aa rr rr ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee dd dd ee ee tt tt ee ee cc cc tt tt ee ee dd dd pp pp rr rr oo oo tt tt oo oo cc cc oo oo ll ll ss ss NOTE: The clear spanning-tree detected-protocols command restarts the protocol-migration process on the switch if any port is connected to a port on a legacy 802.1D switch. Spanning Tree Protocol 147 Troubleshooting Spanning Tree Configuration Example: STP Figure 14-1 illustrates the network topology for the configuration that follows, which shows how to configure STP using commands covered in this chapter. Switch#dd dd ee ee bb bb uu uu gg gg ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee aa aa ll ll ll ll Displays all spanning-tree debugging events Switch#dd dd ee ee bb bb uu uu gg gg ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee ee ee vv vv ee ee nn nn tt tt ss ss Displays spanning-tree debugging topology events Switch#dd dd ee ee bb bb uu uu gg gg ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee bb bb aa aa cc cc kk kk bb bb oo oo nn nn ee ee ff ff aa aa ss ss tt tt Displays spanning-tree debugging BackboneFast events Switch#dd dd ee ee bb bb uu uu gg gg ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee uu uu pp pp ll ll ii ii nn nn kk kk ff ff aa aa ss ss tt tt Displays spanning-tree debugging UplinkFast event Switch#dd dd ee ee bb bb uu uu gg gg ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee mm mm ss ss tt tt pp pp aa aa ll ll ll ll Displays all MST debugging events Switch#dd dd ee ee bb bb uu uu gg gg ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee ss ss ww ww ii ii tt tt cc cc hh hh ss ss tt tt aa aa tt tt ee ee Displays spanning-tree port state changes Switch#dd dd ee ee bb bb uu uu gg gg ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee pp pp vv vv ss ss tt tt ++ ++ Displays PVST+ events 148 Spanning Tree Protocol Figure 14-4 Network Topology for STP Configuration Example VTP Domain stpdemo fa0/13 fa0/8 fa0/5 fa0/5 fa0/8 fa0/8 1 16 g0/1 20 10 1 g0/1 10 1 10 20 20 1 10 g0/1 1 20 g0/2 VTP Client VLAN 10 Root Primary Distribution1 (2960) Core (2960) VLAN 1 Root Primary VTP Server VTP Client VLAN 20 Root Primary Distribution2 (2960) VLAN 10 - Forwarding VLAN 10 - Blocking Spanning Tree Protocol 149 Core Switch (2960) Distribution 1 Switch (2960) Switch>ee ee nn nn aa aa bb bb ll ll ee ee Moves to privileged mode. Switch#cc cc oo oo nn nn ff ff ii ii gg gg uu uu rr rr ee ee tt tt ee ee rr rr mm mm ii ii nn nn aa aa ll ll Moves to global configuration mode. Switch(config)#hh hh oo oo ss ss tt tt nn nn aa aa mm mm ee ee CC CC oo oo rr rr ee ee Sets the host name. Core(config)#nn nn oo oo ii ii pp pp dd dd oo oo mm mm aa aa ii ii nn nn ll ll oo oo oo oo kk kk uu uu pp pp Turns off Dynamic Name System (DNS) queries so that spelling mistakes do not slow you down. Core(config)#vv vv tt tt pp pp mm mm oo oo dd dd ee ee ss ss ee ee rr rr vv vv ee ee rr rr Changes the switch to VTP server mode. This is the default mode. Core(config)#vv vv tt tt pp pp dd dd oo oo mm mm aa aa ii ii nn nn ss ss tt tt pp pp dd dd ee ee mm mm oo oo Configures the VTP domain name to stpdemo. Core(config)#vv vv ll ll aa aa nn nn 11 11 00 00 Creates VLAN 10 and enters VLAN configuration mode. Core(config-vlan)#nn nn aa aa mm mm ee ee AA AA cc cc cc cc oo oo uu uu nn nn tt tt ii ii nn nn gg gg Assigns a name to the VLAN. Core(config-vlan)#ee ee xx xx ii ii tt tt Returns to global configuration mode. Core(config)#vv vv ll ll aa aa nn nn 22 22 00 00 Creates VLAN 20 and enters VLAN configuration mode. Core(config-vlan)#nn nn aa aa mm mm ee ee MM MM aa aa rr rr kk kk ee ee tt tt ii ii nn nn gg gg Assigns a name to the VLAN. Core(config-vlan)#ee ee xx xx ii ii tt tt Returns to global configuration mode. Core(config)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee vv vv ll ll aa aa nn nn 11 11 rr rr oo oo oo oo tt tt pp pp rr rr ii ii mm mm aa aa rr rr yy yy Configures the switch to become the root switch for VLAN 1. Core(config)#ee ee xx xx ii ii tt tt Returns to privileged mode. Core#cc cc oo oo pp pp yy yy rr rr uu uu nn nn nn nn ii ii nn nn gg gg cc cc oo oo nn nn ff ff ii ii gg gg ss ss tt tt aa aa rr rr tt tt uu uu pp pp cc cc oo oo nn nn ff ff ii ii gg gg Saves the configuration to NVRAM. Switch>ee ee nn nn aa aa bb bb ll ll ee ee Moves to privileged mode. Switch#cc cc oo oo nn nn ff ff ii ii gg gg uu uu rr rr ee ee tt tt ee ee rr rr mm mm ii ii nn nn aa aa ll ll Moves to global configuration mode. Switch(config)#hh hh oo oo ss ss tt tt nn nn aa aa mm mm ee ee DD DD ii ii ss ss tt tt rr rr ii ii bb bb uu uu tt tt ii ii oo oo nn nn 11 11 Sets the host name. Distribution1(config)#nn nn oo oo ii ii pp pp dd dd oo oo mm mm aa aa ii ii nn nn ll ll oo oo oo oo kk kk uu uu pp pp Turns off DNS queries so that spelling mistakes do not slow you down. 150 EtherChannel Distribution 2 Switch (2960) EtherChannel EtherChannel provides fault-tolerant, high-speed links between switches, routers, and servers. An EtherChannel consists of individual Fast Ethernet or Gigabit Ethernet links bundled into a single logical link. If a link within an EtherChannel fails, traffic previously carried over that failed link changes to the remaining links within the EtherChannel. Distribution1(config)#vv vv tt tt pp pp dd dd oo oo mm mm aa aa ii ii nn nn ss ss tt tt pp pp dd dd ee ee mm mm oo oo Configures the VTP domain name to stpdemo. Distribution1(config)#vv vv tt tt pp pp mm mm oo oo dd dd ee ee cc cc ll ll ii ii ee ee nn nn tt tt Changes the switch to VTP client mode. Distribution1(config)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee vv vv ll ll aa aa nn nn 11 11 00 00 rr rr oo oo oo oo tt tt pp pp rr rr ii ii mm mm aa aa rr rr yy yy Configures the switch to become the root switch of VLAN 10. Distribution1(config)#ee ee xx xx ii ii tt tt Returns to privileged mode. Distribution1#cc cc oo oo pp pp yy yy rr rr uu uu nn nn nn nn ii ii nn nn gg gg cc cc oo oo nn nn ff ff ii ii gg gg ss ss tt tt aa aa rr rr tt tt uu uu pp pp cc cc oo oo nn nn ff ff ii ii gg gg Saves the configuration to NVRAM. Switch>ee ee nn nn aa aa bb bb ll ll ee ee Moves to privileged mode. Switch#cc cc oo oo nn nn ff ff ii ii gg gg uu uu rr rr ee ee tt tt ee ee rr rr mm mm ii ii nn nn aa aa ll ll Moves to global configuration mode. Switch(config)#hh hh oo oo ss ss tt tt nn nn aa aa mm mm ee ee DD DD ii ii ss ss tt tt rr rr ii ii bb bb uu uu tt tt ii ii oo oo nn nn 22 22 Sets the host name. Distribution2(config)#nn nn oo oo ii ii pp pp dd dd oo oo mm mm aa aa ii ii nn nn ll ll oo oo oo oo kk kk uu uu pp pp Turns off DNS queries so that spelling mistakes do not slow you down. Distribution2(config)#vv vv tt tt pp pp dd dd oo oo mm mm aa aa ii ii nn nn ss ss tt tt pp pp dd dd ee ee mm mm oo oo Configures the VTP domain name to stpdemo. Distribution2(config)#vv vv tt tt pp pp mm mm oo oo dd dd ee ee cc cc ll ll ii ii ee ee nn nn tt tt Changes the switch to VTP client mode. Distribution2(config)#ss ss pp pp aa aa nn nn nn nn ii ii nn nn gg gg tt tt rr rr ee ee ee ee vv vv ll ll aa aa nn nn 22 22 00 00 rr rr oo oo oo oo tt tt pp pp rr rr ii ii mm mm aa aa rr rr yy yy Configures the switch to become the root switch of VLAN 20. Distribution2(config)#ee ee xx xx ii ii tt tt Returns to privileged mode. Distribution2#cc cc oo oo pp pp yy yy rr rr uu uu nn nn nn nn ii ii nn nn gg gg cc cc oo oo nn nn ff ff ii ii gg gg ss ss tt tt aa aa rr rr tt tt uu uu pp pp cc cc oo oo nn nn ff ff ii ii gg gg Saves the configuration to NVRAM. EtherChannel 151 Interface Modes in EtherChannel Guidelines for Configuring EtherChannel • PAgP is Cisco proprietary. • LACP is defined in 802.3ad. • You can combine from two to eight parallel links. • All ports must be identical: — Same speed and duplex — Cannot mix Fast Ethernet and Gigabit Ethernet — Cannot mix PAgP and LACP — Must all be VLAN trunk or nontrunk operational status • All links must be either Layer 2 or Layer 3 in a single channel group. • To create a channel in PAgP, sides must be set to — Auto-Desirable — Desirable-Desirable • To create a channel in LACP, sides must be set to — Active-Active — Active-Passive • To create a channel without using PAgP or LACP, sides must be set to On-On. • Do not configure a GigaStack gigabit interface converter (GBIC) as part of an EtherChannel. Mode Protocol Description On None Forces the interface into an EtherChannel without PAgP or LACP. Channel only exists if connected to another interface group also in On mode. Auto PAgP Places the interface into a passive negotiating state—will respond to PAgP packets but will not initiate PAgP negotiation. Desirable PAgP Places the interface into an active negotiating state—will send PAgP packets to start negotiations. Passive LACP Places the interface into a passive negotiating state—will respond to LACP packets but will not initiate LACP negotiation. Active LACP Places the interface into an active negotiating state—will send LACP packets to start negotiations. 152 EtherChannel • An interface that is already configured to be a Switched Port Analyzer (SPAN) destination port will not join an EtherChannel group until SPAN is disabled. • Do not configure a secure port as part of an EtherChannel. • Interfaces with different native VLANs cannot form an EtherChannel. • When using trunk links, ensure all trunks are in the same mode—Inter-Switch Link (ISL) or dot1q. Configuring Layer 2 EtherChannel Verifying EtherChannel Switch(config)#ii ii nn nn tt tt ee ee rr rr ff ff aa aa cc cc ee ee rr rr aa aa nn nn gg gg ee ee ff ff aa aa ss ss tt tt ee ee tt tt hh hh ee ee rr rr nn nn ee ee tt tt 00 00 // // 11 11 44 44 Moves to interface range configuration mode. Switch(config-if-range)#cc cc hh hh aa aa nn nn nn nn ee ee ll ll pp pp rr rr oo oo tt tt oo oo cc cc oo oo ll ll pp pp aa aa gg gg pp pp Specifies the PAgP protocol to be used in this channel. Or Switch(config-if-range)#cc cc hh hh aa aa nn nn nn nn ee ee ll ll pp pp rr rr oo oo tt tt oo oo cc cc oo oo ll ll ll ll aa aa cc cc pp pp Specifies the LACP protocol to be used in this channel. Switch(config-if-range)#cc cc hh hh aa aa nn nn nn nn ee ee ll ll gg gg rr rr oo oo uu uu pp pp 11 11 mm mm oo oo dd dd ee ee {dd dd ee ee ss ss ii ii rr rr aa aa bb bb ll ll ee ee | aa aa uu uu tt tt oo oo | oo oo nn nn | pp pp aa aa ss ss ss ss ii ii vv vv ee ee | aa aa cc cc tt tt ii ii vv vv ee ee } Creates channel group 1 and assigns interfaces 01–04 as part of it. Use whichever mode is necessary, depending on your choice of protocol. Switch#ss ss hh hh oo oo ww ww rr rr uu uu nn nn nn nn ii ii nn nn gg gg cc cc oo oo nn nn ff ff ii ii gg gg Displays list of what is currently running on the device Switch#ss ss hh hh oo oo ww ww rr rr uu uu nn nn nn nn ii ii nn nn gg gg cc cc oo oo nn nn ff ff ii ii gg gg ii ii nn nn tt tt ee ee rr rr ff ff aa aa cc cc ee ee ff ff aa aa ss ss tt tt ee ee tt tt hh hh ee ee rr rr nn nn ee ee tt tt 00 00 // // 11 11 22 22 Displays interface fastethernet 0/12 information Switch#ss ss hh hh oo oo ww ww ee ee tt tt hh hh ee ee rr rr cc cc hh hh aa aa nn nn nn nn ee ee ll ll Displays all EtherChannel information Switch#ss ss hh hh oo oo ww ww ee ee tt tt hh hh ee ee rr rr cc cc hh hh aa aa nn nn nn nn ee ee ll ll 11 11 pp pp oo oo rr rr tt tt cc cc hh hh aa aa nn nn nn nn ee ee ll ll Displays port channel information Switch#ss ss hh hh oo oo ww ww ee ee tt tt hh hh ee ee rr rr cc cc hh hh aa aa nn nn nn nn ee ee ll ll ss ss uu uu mm mm mm mm aa aa rr rr yy yy Displays a summary of EtherChannel information Switch#ss ss hh hh oo oo ww ww pp pp aa aa gg gg pp pp nn nn ee ee ii ii gg gg hh hh bb bb oo oo rr rr Shows PAgP neighbor information Switch#cc cc ll ll ee ee aa aa rr rr pp pp aa aa gg gg pp pp 11 11 cc cc oo oo uu uu nn nn tt tt ee ee rr rr ss ss Clears PAgP channel group 1 information Switch#cc cc ll ll ee ee aa aa rr rr ll ll aa aa cc cc pp pp 11 11 cc cc oo oo uu uu nn nn tt tt ee ee rr rr ss ss Clears LACP channel group 1 information [...]... 172.16.10.2/24 fa0/9-12 172.16.20.0/24 fa0/5 -8 172.16.10.0/24 WS1 Marketing VLAN 20 fa0/12 Accounting VLAN 10 fa0/6 fa0/1 ALSwitch1 (2960) fa0/2 fa0/1 Core (2960) WS3 fa0/5 -8 172.16.10.0/24 Accounting VLAN 10 fa0/6 172.16.20.3/24 WS4 fa0/9-12 172.16.20.0/24 Marketing VLAN 20 fa0/12 ALSwitch2 (2960) fa0/1 fa0/2 172.16.10.3/24 fa0/4 fa0/3 FEC IEEE 80 2. 1q Trunk Figure 14-5 FEC IEEE 80 2. 1q Trunk EtherChannel Network... This chapter provides information and commands concerning the following topics: • Wireless access point configuration: Linksys 300N access point • Wireless client configuration: Linksys Wireless-N Notebook Adapter NOTE: This chapter contains information that is not part of the objective list of knowledge needed for passing the CCNA 640- 901 certification exam However, the Cisco Networking Academy Program has... evaluated on the CCNA certification exam Wireless Access Point Configuration: Linksys 300N Access Point NOTE: The wireless access point (AP) used in this chapter is the Linksys Wireless-N Broadband Router If you are using a different AP, the screen captures shown here may differ It is important to use the most up-to-date firmware or drivers This is especially true for the 300N AP because the 80 2. 11n technology... mode v ALSwitch2(config)#vtp domain testdomain Configures the VTP domain name to testdomain i ALSwitch2(config)#interface range fastethernet 0/5 – 8 Moves to interface range configuration mode s ALSwitch2(config-if-range)#switchport mode access Sets ports 5 8 as access ports s ALSwitch2(config-if-range)#switchport access vlan 10 Assigns ports to VLAN 10 e ALSwitch2(config-if-range)#exit Moves to global... Core(config-vlan)#exit Returns to global configuration mode i Core(config)#interface range fastethernet 0/1 – 4 Moves to interface range configuration mode s Core(config-if)#switchport trunk encapsulation dot1q Specifies 80 2. 1q encapsulation on the trunk link s Core(config-if)#switchport mode trunk Puts the interface into permanent trunking mode and negotiates to convert the link into a trunk link e Core(config-if)#exit... mode v ALSwitch1(config)#vtp domain testdomain Configures the VTP domain name to testdomain i ALSwitch1(config)#interface range fastethernet 0/5 – 8 Moves to interface range configuration mode ALSwitch1(config-ifs range)#switchport mode access Sets ports 5 8 as access ports ALSwitch1(config-ifs range)#switchport access vlan 10 Assigns ports to VLAN 10 e ALSwitch1(config-if-range)#exit Moves to global... Topology for EtherChannel Configuration 153 Configuration Example: EtherChannel Figure 14-2 illustrates the network topology for the configuration that follows, which shows how to configure EtherChannel using commands covered in this chapter 154 EtherChannel Core (2960) e Switch>enable Moves to privileged mode c Switch#configure terminal Moves to global configuration mode h Switch(config)#hostname Core Sets... License Agreement Figure 15-3 shows the wizard asking you to unplug the power from your modem When you have finished, click Next Wireless Access Point Configuration: Linksys 300N Access Point Figure 15 -8 163 Unplugging Power to the Modem Figure 15-4 shows the wizard asking you to unplug the modem from your computer When you have finished, click Next Figure 15-9 Disconnecting the Modem from the Computer... asking you to plug power back into the modem Figure 15-11 Connect the Power to the Modem Wireless Access Point Configuration: Linksys 300N Access Point 165 In the screens shown in Figure 15-7 and Figure 15 -8, the wizard asks you to connect your router to a computer To install this device correctly, you must have a wired connection to it After this, you can configure the device to accept wireless clients The . configure EtherChannel using commands covered in this chapter. Figure 14-5 Network Topology for EtherChannel Configuration ALSwitch1 (2960) FEC IEEE 80 2. 1q Trunk FEC IEEE 80 2. 1q Trunk Core (2960) 172.16.10.2/24 fa0/6 fa0/12 fa0/6. convergence based on the 80 2. 1w standard. • Multiple Spanning Tree Protocol (MSTP)—IEEE 80 2. 1s. Extends the 80 2. 1w Rapid Spanning Tree (RST) algorithm to multiple spanning trees. Multiple VLANs. pp pp vv vv ss ss tt tt ++ ++ Displays PVST+ events 1 48 Spanning Tree Protocol Figure 14-4 Network Topology for STP Configuration Example VTP Domain stpdemo fa0/13 fa0 /8 fa0/5 fa0/5 fa0 /8 fa0 /8 1 16 g0/1 20 10 1 g0/1 10 1 10 20 20 1 10 g0/1 1 20 g0/2 VTP