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Questions and Answers
What is the primary purpose of Inter-VLAN routing?
What is a characteristic of traditional Inter-VLAN routing?
What is removed from a frame during the Inter-VLAN routing process?
What is a key feature of Router-on-a-stick Inter-VLAN routing?
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What is the purpose of a subinterface in Inter-VLAN routing?
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What is a trunk link in the context of Inter-VLAN routing?
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What is the purpose of creating a subinterface in router-on-a-stick inter-VLAN routing?
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What is the syntax to create a subinterface in router configuration mode?
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Which command is used to assign a subinterface to a VLAN?
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What is the purpose of the management VLAN?
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What is the outcome of assigning an IP address to a subinterface?
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What is the typical association between the subinterface number and the VLAN number?
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What is the limitation of traditional inter-VLAN routing using physical interfaces?
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What is the function of a subinterface in router-on-a-stick inter-VLAN routing?
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What is a trunk link connected to in a router-on-a-stick inter-VLAN routing configuration?
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Study Notes
Inter-VLAN Routing
- Inter-VLAN routing is the process of forwarding traffic from one VLAN to another VLAN using a router.
- Each VLAN is a unique broadcast domain and IP subnetwork, and computers on separate VLANs cannot communicate by default.
Traditional Inter-VLAN Routing
- Requires a router to have multiple physical interfaces, each connected to a VLAN and configured with an IP address for the subnet associated with that VLAN.
- Each interface is routed internally to the proper subnet, and VLAN tags are removed.
- This method is limited by the physical hardware limitations of a router.
Router-on-a-Stick Inter-VLAN Routing
- Overcomes the hardware limitation of a router by using subinterfaces, which are software-based virtual interfaces assigned to physical interfaces.
- Each subinterface is configured with its own IP address, subnet mask, and unique VLAN assignment.
- Functionally the same as using the traditional routing model.
- Uses a single physical interface for all VLANs, with VLAN tags removed and added as needed.
Configuring Subinterfaces
- Create a subinterface with a syntax of
interface [interface].nn, wherennis the subinterface number (typically associated with the VLAN number). - Assign the subinterface to a VLAN using
encapsulation dot1q vlan-id. - Assign an IP address to the subinterface, which will become the default gateway for that VLAN.
Layer 3 Switch Inter-VLAN Routing
- Uses Switch Virtual Interfaces (SVI) to retag the frame.
- VLAN tags are removed and added as needed.
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Description
Learn about configuring subinterfaces and router-on-a-stick inter-VLAN routing, including assigning IP addresses and VLANs. Test your knowledge of Chapter 6 interfaces and subinterfaces.
