TAILIEUCHUNG - Lecture Medium-Sized Switched Network Construction - Chapter 2: Routing Between VLANs

This chapter introduce routing between VLANs. Inter-VLAN routing using a router on a stick utilizes an external router to pass traffic between VLANs. A router on a stick is configured with a subinterface for each VLAN and trunk encapsulation. | Medium-Sized Switched Network Construction Routing Between VLANs VLAN-to-VLAN Overview Network layer devices combine multiple broadcast domains. Purpose: This figure shows a router on a stick being used to interconnect VLANs. Emphasize: The VLANs are on different networks. Without a network layer device they could not communicate. Review the protocols operating at each of the OSI layers. Dividing a Physical Interface into Subinterfaces Physical interfaces can be divided into multiple subinterfaces. Purpose: This figure shows a subinterface example. Subinterfaces will be covered later in this course. Emphasize: At this point, it is important for students to understand that if they want to connect multiple VLANs, they need a separate connection for each VLAN. This can be accomplished by establishing a physical connection for each VLAN that will interconnect with other VLANs, or by splitting a trunk into multiple, logical subinterfaces. Routing Between VLANs with Trunks interface fastethernet 0/0 ip address interface fastethernet 0/ ip address encapsulation dot1q 2 Summary Inter-VLAN routing using a router on a stick utilizes an external router to pass traffic between VLANs. A router on a stick is configured with a subinterface for each VLAN and trunk encapsulation.