TAILIEUCHUNG - PortFast/UplinkFast/BackboneFast

You have just implemented a new redundant switched network. You start receiving calls from users reporting they can’t log into their NT domain. You discover their PCs are not getting an IP address from the DHCP server. After further investigation, you realize that when a workstation is powered on it takes about 30 seconds for the port to become active. This means they are booting up faster than the switch port can be configured. In other words, while the PC is requesting a DHCP address, the switch port is still going through the listening and learning modes | Lab PortFast UplinkFast BackboneFast Workstation Port 2 3 Port 2 34 DLSwitch1 4006 24 Port 1 Port 12 ALSwitch 2900XL 24 Objective Use PortFast UplinkFast and BackboneFast to improve the time it takes for the spanning-tree algorithm to configure the mode of the port. Scenario You have just implemented a new redundant switched network. You start receiving calls from users reporting they can t log into their NT domain. You discover their PCs are not getting an IP address from the DHCP server. After further investigation you realize that when a workstation is powered on it takes about 30 seconds for the port to become active. This means they are booting up faster than the switch port can be configured. In other words while the PC is requesting a DHCP address the switch port is still going through the listening and learning modes. You also noticed that when the active uplink between your two switches is broken it takes the redundant link the same 30 seconds to complete the spanning-tree process before bringing up the backup blocked link. This results in a network outage for your users. We will use the PortFast UplinkFast and BackboneFast commands to assist spanning-tree in bringing these convergence times down. Lab Tasks 1. First configure your 4000 switch to the diagram above. You can skip this step if you already have the Lab 4000 initial setup configured. Console enable Console enable set system name DLSwitchl System name set. DLSwitch1 enable DLSwitch1 enable set password Enter old password Because you do not currently have a password just hit enter Enter new password Retype new password Password changed. DLSwitch1 enable set enablepass Enter old password Because you do not currently have a password just hit enter Enter new password Retype new password Password changed. DLSwitch1 enable set interface sc0 DLSwitch1 enable set interface sc0 1 2. Next configure your 2900 switch to the diagram above. .

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