One important thing to note about the default SVI interface VLAN 1, is that it IS present on the switch by default, however it is ADMIN DOWN as well – It must be “no shut” on the interface VLAN 1 to be Up / Active! SW1 now has an IP Address that can be used to telnet / ssh to it for remote management, before any sort of VLANs are added onto it, so either Host A or Host B could reach the switch for management purposes – All on default SVI interface VLAN 1! *Mar 1 00:05:37.096: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up *Mar 1 00:05:37.087: %LINK-3-UPDOWN: Interface Vlan1, changed state to up Vlan1 unassigned YES unset administratively down downįastEthernet1/0/1 unassigned YES unset up upįastEthernet1/0/2 unassigned YES unset up upįastEthernet1/0/3 unassigned YES unset up up Interface IP-Address OK? Method Status Protocol To demonstrate the default SVI interface VLAN 1, I completely wiped out the switches configurations, then verified the SVI’s status and proceeded with configuration: This type of Layer 3 interface is specifically meant for communication on switches between VLANs, because it is an extension of the VLAN # itself being the “gateway” for that VLAN, and the most important distinction is that it allows for Layer 2 protocols such as STP / DTP / Etc to run!
SVIs are logical interfaces on a switch that are tied to certain VLANs, providing a Layer 3 gateway for configured VLANs on the switch, allowing Inter-VLAN communication.Ĭisco switches have a default SVI called interface VLAN 1, referred to as the “Management Interface” if the switch is running as a Layer 2 device, as assigning an IP Address to this interface in a “flat” network configuration (one subnet) will allow for remote access via telnet or ssh to the switch from the devices on the same subnet – Hence the name Management Interface. If things are going wrong with MLS routing in the exam room or on the job, make sure that “ip routing” is enabled on the switch, or if given a scenario where 元 routing is an issue on an MLS then “ip routing” could be a correct answer from multiple choices! This means SVI = Logical interface, and Routed Port = Physical interfaceīefore diving into the two, it is very important to note that “ip routing” must be globally configured on the switch or NO routing will occur between VLANs or Routed Ports:Įnter configuration commands, one per line. Routed Port = Re-configuring a Physical interface.
SVI = Creating a Logical Interface for configuration.Two distinct differences between the two interfaces for exam day: There are two types of Layer 3 ports that can be configured on a switch depending on what you need to do, an SVI is for Inter-VLAN communication on a switch without the need for a router, and a Routed Port functions entirely at Layer 3 (no L2 services). This is a very basic lab with a lot of concepts / gotchas labbed toward the bottom half of the post, very important behaviors to know for exam day, but as always first the fundamentals and theory that is a must know for exam day!įundamentals of SVI (Switch Virtual Interface) vs 元 / Routed Ports
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