How do I enable subinterfaces?
To configure additional IP interfaces over the VLAN major interface:
- Create a new VLAN subinterface by adding a unique subinterface number to the interface identification command. host1(config-if)#interface fastEthernet 4/1.2.
- Assign a VLAN ID for the subinterface.
- Assign an IP address and mask.
What is the use of subinterfaces?
One of the uses of subinterfaces is to provide unique Layer 3 interfaces to each VLAN that is supported by the parent interface. In this scenario, the parent interface connects to a Layer 2 trunking port on another device.
What is subinterface in networking?
A subinterface is a virtual interface created by dividing one physical interface into multiple logical interfaces. A sub-interface in a Cisco Router uses the parent physical interface for sending and receiving data.
How many subinterfaces can be configured on an interface Cisco?
You can partition one physical interface into up to 4094 different subinterfaces, one for each VLAN.
How are subinterfaces used in the router on a stick configuration?
The sub-interface is a key feature of the router on a stick. It is configured for each network on the router. Sub-interfaces are the logical elements of a physical interface. Thanks to this approach it is not necessary to use N physical interfaces of the router on N VLANs.
How do you remove a subinterface?
Locate and expand the Etherchannel interface that the subinterface is a member of. Select the desired subinterface you want to delete. In the Actions pane located to the right, click Remove. Confirm you want to delete the subinterface interface and click OK.
What is the maximum number of virtual Lans allowed per physical interface?
4,094
Under IEEE 802.1Q, the maximum number of VLANs on a given Ethernet network is 4,094 (4,096 values provided by the 12-bit VID field minus reserved values at each end of the range, 0 and 4,095).
What is ip nat inside?
Translates the source IP address of packets that travel from inside to outside. Translates the destination IP address of packets that travel from outside to inside.
What is the purpose of the subinterface when using router in a stick?
What is configuration mode?
Global Configuration mode mode allows users to modify the running system configuration. From the Privileged mode a user can move to configuration mode by running the “configure terminal” command from privileged mode. To exit configuration mode, the user can enter “end” command or press Ctrl-Z key combination.
What are the types of configuration mode?
There are five command modes: global configuration mode, interface configuration mode, subinterface configuration mode, router configuration mode, and line configuration mode.
How are subinterfaces created in a Cisco router?
If we have one Router with one physical interface, but needed to have the router connected to two IP networks to route traffic between two routers, we can create two sub interfaces within the physical interface, assign each sub interface an IP address within each subnet and then route the data between two subnets.
How to configure a layer 3 sub interface?
After you run the undo portswitch command to switch Layer 2 interfaces on the preceding series of cards into Layer 3 interfaces, you can configure Layer 3 sub-interfaces on the interfaces. The SA series cards do not support sub-interface configuration and cannot forward IP traffic to sub-interfaces on other cards.
How to create a subinterface for a VLAN interface?
The VLAN major interface is added. Create a VLAN subinterface by adding a subinterface number to the interface identification command. Assign a VLAN ID for the subinterface. Assign a VLAN ID and the optional unique MAC address for the subinterface. Assign an IP address and mask.
What makes a parent interface a subinterface?
A parent interface is a physical port. Subinterfaces can be created on Layer 3 physical interfaces and Layer 3 port channels. A subinterface can be associated with different functionalities such as IP addressing, forwarding policies, Quality of Service (QoS) policies, and security policies.
