2.9 Configure, verify, and troubleshoot (Layer 2/Layer 3) EtherChannel

2.9.a Static To configure static ether channels use the “mode on” option. Then configure the port range and the port channel interface with the “no switchport” option. Switch>en Switch#conf t Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#^Z %SYS-5-CONFIG_I: Configured from console by console Switch#show spanning-tree VLAN0001 Spanning tree enabled protocol ieee Root …

2.10 Describe the benefits of switch stacking and chassis aggregation

Switch stacking and chassis aggregation allows the expansion of a switch without increasing management complexity. This is achieved because the switch stack acts as a single logical switch. This means protocols like SSH, CDP, VTP and STP run off a single switch. This also means there is also a single configuration file to maintain and …

2.8 Configure and verify Layer 2 protocols

2.8.a Cisco Discovery Protocol ! check if CDP is enabled: R2#show cdp % CDP is not enabled R2# *Jun 2 21:30:46.407: %SYS-5-CONFIG_I: Configured from console by console R2#show cdp % CDP is not enabled R2#conf t Enter configuration commands, one per line. End with CNTL/Z. ! to enable CDP: R2(config)#cdp run R2(config)#^Z R2# *Jun 2 …

2.7 Configure, verify and troubleshoot STP related optional features

2.7.a PortFast Port fast disables STP on a port allowing the interface to start forwarding immediately by bypassing STP safety checks. This should be used with caution and only on ports NOT connected to other switches! IOU1(config-if)#spanning-tree portfast   2.7.b BPDU guard BPDU guard will immediately place the port in an err-disabled state if it …

2.6 Configure, verify, and troubleshoot STP protocols

2.6.a STP mode (PVST+ and RPVST+) STP or Spanning Tree Protocol allows for redundant links to be installed in switched networks without create switching loops where the same packet is forwarded again and again around the network. PVST and RPVST refer to Per VLAN Spanning Tree Protocol and Rapid Per VLAN Spanning Tree Protocol. Consider …