Use it only for basic operations Open vSwitch īy leveraging GNS3 support for Docker, you can now add Open vSwitch to your GNS3 topologies. It’s not running a switch OS, everything is emulated from scratch. While an Etherswitch module does not support advanced layer 2 features, it does allow you to configure basic VLANs, Spanning Tree and other options. This is the official Cisco way of emulating a switch. With a Cisco VIRL IOSvL2 image, you can configure and test a wide range of advanced switching features. Recommended_switching_platform Cisco VIRL IOSvL2 Your selection of image and platform will affect what is possible. While this was true in the past, GNS3 now supports options such as:Ĭomplimentary campus technologies such as HSRP are also supported. Host.One common misconception about GNS3 is that GNS3 does not support advanced switching options. L2-SW-6(config-if)#spanning-tree portfast L2-SW-6(config)#interface gigabitethernet0/3 L2-SW-5#show run | begin interface GigabitEthernet0/3Ĭisco Switch L2-SW-6 PortFast operation L2-SW-6#conf t *Sep 27 17:44:49.861: %SYS-5-CONFIG_I: Configured from console by console L2-SW-5(config-if)#spanning-tree portfast L2-SW-5(config)#interface gigabitethernet0/3 L2-SW-4#show run | begin interface GigabitEthernet0/3Ĭisco Switch L2-SW-5 PortFast operation L2-SW-5#conf t *Sep 27 17:41:23.448: %SYS-5-CONFIG_I: Configured from console by console L2-SW-4(config-if)#spanning-tree portfast L2-SW-4(config)#interface gigabitethernet0/3 L2-SW-3#show run | begin interface GigabitEthernet0/3Ĭisco Switch L2-SW-4 PortFast configuration process L2-SW-4#conf t *Sep 27 17:40:32.880: %SYS-5-CONFIG_I: Configured from console by console Have effect when the interface is in a non-trunking mode. %Portfast has been configured on GigabitEthernet0/3 but will only Interface when portfast is enabled, can cause temporary bridging loops. Connecting hubs, concentrators, switches, bridges, etc. %Warning: portfast should only be enabled on ports connected to a single L2-SW-3(config-if)#spanning-tree portfast L2-SW-3(config)#interface gigabitethernet0/3 The purpose of PortFast configuration in Layer 2 Switches is to ensure that interfaces configure as PortFast from STP Convergence processing is not processed during BPDU packet exchange.Ĭisco Switch L2-SW-3 Spanning Tree PortFast configuration process L2-SW-3#conf t To configure STP PortFast on Cisco Switches, use the following commands on the Switch interfaces to which VPCS PCs are connected, and check the PortFast configuration with the “ show running-config | begin interface GigabitEthernet0/3” command. L2-SW-2#show spanning-treeĬisco Switch L2-SW-3 show spanning-tree command output L2-SW-3#show spanning-treeīridge ID Priority 32769 (priority 32768 sys-id-ext 1)Ĭisco Switch L2-SW-4 show spanning-tree command output L2-SW-4#show spanning-treeĬisco Switch L2-SW-5 show spanning-tree command output L2-SW-5#show spanning-treeĬisco Switch L2-SW-6 show spanning-tree command output L2-SW-6#show spanning-treeĬisco Switch L2-SW-7 show spanning-tree command output Determine the Port Status of Cisco Switches by following the steps below.Īt the L2-SW-2 Switch CLI prompt, execute the show spanning-tree command and define the Designated, Root, and Blocked port states. In previous posts, we have reviewed the STP protocol for STP Port status. L2-SW-2(config)#spanning-tree vlan 1 root secondaryīridge ID Priority 28673 (priority 28672 sys-id-ext 1) To configure the Cisco Switch L2-SW-2 as a Secondary Root Bridge, use the following command, and then check the Priority value of the L2-SW-2 Switch. Hello Time 2 sec Max Age 20 sec Forward Delay 15 secīridge ID Priority 24577 (priority 24576 sys-id-ext 1) *Sep 27 17:18:03.648: %SYS-5-CONFIG_I: Configured from console by console L2-SW-1(config)#spanning-tree vlan 1 root primary L2-SW-1#conf tĮnter configuration commands, one per line. To select L2-SW-1 as Root Bridge, use the command below and then check with the show spanning-tree command. In this article, we will use the Root Primary command to select the Root Bridge. You can configure this process in two ways ġ) You can configure it using the spanning-tree vlan 1 priority command.Ģ) You can configure it using the spanning-tree vlan 1 root command. Priority values are taken into consideration when selecting manual Root Bridge. Configure Cisco Switch L2-SW1 as Root Bridge and configure L2-SW-2 Switch as Secondary Root Bridge.
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