Configuring trunk port. HTH, Ed. When configuring trunk port, set it to nonegotiate. Define the minimum and maximum number of active bundled. That takes cares of the trunks, and here are the VLANs: The switchport mode command can be configured using 4 different options: Trunk: The interface is configured into permanent trunking mode and negotiates with the partner site interface to set up the into trunk mode. VLAN 2-1001: This is a normal VLAN range. It works on Layer 2 of the OSI model.VLAN trunks formed using DTP may utilize either IEEE 802.1Q or Cisco ISL trunking … A trunk port can carry traffic in one or more VLANs on the same physical link (VLANs are based on the trunk-allowed VLANs list). Specify the port mode as active for the links in a port channel. SW3(config)#interface fa0/14 SW3(config-if)#switchport trunk encapsulation dot1q SW3(config-if)#switchport mode trunk SW3(config)#interface fa0/16 SW3(config-if)#switchport trunk encapsulation dot1q SW3(config-if)#switchport mode trunk. Final Note. The Dynamic Trunking Protocol (DTP) is a proprietary networking protocol developed by Cisco Systems for the purpose of negotiating trunking on a link between two VLAN-aware switches, and for negotiating the type of trunking encapsulation to be used. Therefore, if the ESXi/ESX host is set to VST mode, it drops the packets that are lacking a VLAN tag. As we previously discussed, a trunk port is used to carry multiple VLAN traffic. On some switches you'll see n- and if you see n-, it means it was negotiated. After creating the VLAN, insure that each switchport used for the phone is set to a tagged (aka trunked) interface, because untagged traffic will default to the switch's native VLAN (which for us is VLAN1). Double Tagging. CCNP labs also provided to practice AAA (Radius authentication) , etherchannel, and wired 802.1x We can see the Encapsulation. In the above commands, we have specified an interface range and then proceeded to configure all the ports specified as access ports. spanning-tree guard root. This sample is a supported Cisco Trunk Port configuration: interface GigabitEthernet1/2 switchport (Set to layer 2 switching) switchport trunk encapsulation dot1q (ESXi/ESX only supports dot1q, not ISL) Here, there is no need to assign VLAN to the ports as all the switch ports on both switches are configured as VLAN 1 by default. In this situation we no longer have a need to use Trunk or General mode between the switches. To prevent a Double Tagging attack, keep the native VLAN of all trunk ports different from user VLANs. By default, a trunk interface can carry traffic for all VLANs. end. Interface fa0/5 is configured as trunk and will be used to for inter-VLAN communication. Trunking is a technique used in data communications transmission systems to provide many users with access to a network by sharing multiple lines or frequencies. This command is helpful when you need to return the trunk configuration back to default. Port-specific bridging configuration comes from the switch where the port physically lives. CCNA Security labs can be downloaded for ASA Firewall, clientless SSL VPN, site to site VPN, and firewalling with deep packet inspection simulation. A trunk is typically a link between two switches or a switch and a router. As the name implies, the system is like a tree with one trunk and many branches. switchport mode; trunk encapsulation type (must be dot1q) native VLAN mismatch; allowed VLAN mismatch . In this session, we will configure the switchport as a trunk. UBNT(config)# interface swp1 UBNT(config-if)# no switchport UBNT(config-if)# channel-group 1 mode active UBNT(config-if)# interface swp2 UBNT(config-if)# no switchport Dell(config-if-Gi1/0/1)# switchport mode trunk: Set the switchport mode to trunk. 2) Set the specific port to trunk mode. Cisco Packet Tracer 8.x labs for CCENT and CCNA exam simulations training. switchport switchport trunk encapsulation switchport mode trunk switchport nonegotiate – If you reconfigure a secure access po rt as a trunk, port security converts all the sticky and static secure addresses on that port that were dynamically learned in the access VLAN to sticky or static secure addresses on the native VLAN of the trunk. MySwitch(config-if)#switchport trunk encapsulation dot1q [Configure the port to support 802.1Q Encapsulation (default is negotiate)] MySwitch(config-if)#switchport mode trunk The Native vlan 99, that needs to match on both sides. Switch(config)#interface fastEthernet 0/1 Switch(config-if)#switchport mode trunk Switch(config-if)# 2. We can create, edit and delete these VLAN. DC1R5_SwitchB(config-if-range)# channel-group 1 mode passive. When I hit enter that is when I get the message: Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode. Note: The spanning-tree portfast trunk command should never be used on … load-interval 30. spanning-tree bpduguard disable. By default, all switch ports are in VLAN. Trunking is commonly used in very-high-frequency (VHF) radio and telecommunication systems. DC1R5_SwitchB(config-if-range)# switchport trunk native vlan 99. This VLAN can’t be deleted or edit but can be used. On the SRX Branch Series each interface can be configured as either layer 2 or layer 3. I put in a Cisco 2960 switch and type the same thing and everything is good. switchport mode trunk switchport mode nonegotiate; Shutdown all interfaces that are not currently in use. Step 7: Verify that the ports have been aggregated. Cisco Catalyst switch trunk ports use DTP to negotiate the state of the link. switchport mode trunk . Instead we can create a common VLAN that will be used for the connection between the two switches. Just navigate to FastEthernet 0/1 interface and type “switchport mode trunk“ the press enter to enable trunking on Fa0/1 interface line. In the following scenario, we have a Cisco Meraki access switch uplinked to an other (non-Meraki) switch. switchport nonegotiate. MySwitch(config)#interface g0/2. Trunk links are normally configured statically with the switchport mode trunk command. However, it is important to utilize security measures at every level. These are shown below : Routed Ports – Layer 3 (inet); Bridge – Layer 2 (only used for transparent mode); Ethernet-switching – Layer 2 (switchport); Within this article we will look at how to configure a trunk and access port as switchports (aka ethernet-switching). VLAN 0, 4095: These are reserved VLAN which cannot be seen or used. This can be configured in a few different ways but will achieve the same result. The Status is trunking, that's good. Switch(config-if)#int range fa0/1-4 Switch(config-if-range)#switchport mode access. switchport trunk allowed vlan 100,200 – Allowed VLANs; switchport mode trunk – Enables Trunk; switchport nonegotiate – ESX/ESXi does not support DTP dynamic trunking protocol. Take care to configure VLANs and port settings identically on both MLAG peers. To create this VLAN we will run … 3) Enable the spanning-tree portfast trunk function to ensure the port will forward packets immediately when connected to a device e.g router. Instructions for Cisco devices look like: interface FastEthernet0/7 description Mike's phone switchport mode trunk DHCP configuration Dell(config-if-Gi1/0/1)# switchport trunk allowed vlan add 50,100 Access: Disables port trunk mode; no trunking negotiation takes place. switchport mode trunk. I have never seen the vlan add statement listed in the interface config. The switchport nonegotiate command is issued to prevent DTP (negotiation) packets from being sent out the interface. spanning-tree portfast trunk – Enables PortFast on the interface when it is in trunk mode. Why did it not simply add it to the list of allowed vlans? This includes switchport access vlan, switchport mode, trunk allowed vlans, trunk native vlan, and switchport trunk groups. VLAN 1: It is the default VLAN of switches. Below is the trunk port configuration for Cisco IOS Switches: Configuring Trunk Ports. Define LACP ports allowed in a port channel. Switches were not built for security. DC1R5_SwitchB(config-if-range)# switchport mode trunk. Configuration – Switchport Mode Trunk. This is on 4 interfaces that are configured the same. By default, a … # switchport mode access eg:#switchport mode access # switchport access vlan [vlan number] eg:switchport access vlan 10 . Switch1(config)#interface fa0/0 Switch1(config-if)#switchport mode access. Trunk ports – These switch ports belong to and carry the traffic of more than one VLAN. Whether the device does or does not trunk is dictated by the mode parameter: access or trunk. Dell(config-if-Gi1/0/1)# switchport trunk allowed vlan all: By default trunk mode allows all vlans. This allows multiple VLANs to traverse the interface/link. To eliminate confusion, these commands are instructing the switch thus: 1) Define the trunk to use the 802.1q protocol. 1. Creating a port-channel interface Port-channel 1 DC1R5_SwitchB(config-if-range)# no shutdown. Mode on says the switchport mode trunk command was used. When a port on a trunk link is configured with a trunk mode that is incompatible with the neighboring trunk port, a trunk link fails to form between the two switches. Static MAC addresses and MLAG: switch(config-if)# switchport mode {access | trunk} Sets the interface as an Ethernet trunk port.

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