#How to create a vlan on a cisco switch mac#

Tagged Ports and Untagged PortsДЄ Trunk port on a switch can receive traffic for more than one VLAN. We will uncover the reason for this later in this article. Conversely, switch ports connected to other network devices are configured as Trunk portsВ (e.g., other switches, routers). Typically, switch ports connected to end-host devices are configured as Access portsВ (e.g., workstations, printers, servers).

We were able to use a total of four Trunk ports (across both switches) to replace eight different Access ports in the prior illustration.

This physical topology operates (logically) identically to the illustration above it, but requires far fewer switch ports. This enables us to leave more ports available to add hosts to the network in the future. We can use Trunk ports to reduce the amount of switch ports required for the topology above. A Trunk port is a switch port thatВ carries traffic for multiple VLANs. Instead, there is a mechanism which allows a single switch port to carry traffic from multiple VLANs. Imagine if our topology was using ten VLANs, on a 24 port switch nearly half of the ports would be taken up by the inter-switch links. In order to extend a VLAN to the second switch, a connection is made between oneВ Access port on both switches for each VLAN.В While functional, this strategy does not scale. Whenever the switch receives any traffic on an Access port, it accepts the traffic onto the configured VLAN. When configuring a port as an Access port, the administrator also designates the VLAN number that port is a member of. An Access port is a switch port thatВ is a member of only one VLAN. A single VLAN can span across multiple rooms, floors, or office buildings.Д®ach connected switch port in the topology above is a member of only a single VLAN. The primary benefit of extending a VLAN to different physical switches is that theВ Layer 2 topologyВ no longer has to be tied to theВ Physical Topology. This enables Host A and Host C to exist in the same VLAN, despite being connected to different physical switches located in potentially different areas. Notice how a VLAN# 10 and VLAN# 30 have been extended onto a second switch.

To illustrate this point, we will expand the topology above with an additional physical switch and two additional hosts: Extending Virtual Switches across multiple Physical Switches This is the first majorВ function of a VLAN.Д«ut that isnвЂ™t all VLANs allow you to do.В TheВ second majorВ function is VLANs allow you to extend the smaller Virtual switches across multiple Physical switches. Ultimately, assigning different ports to different VLANs allows you to re-use a single physical switch for multiple purposes.

#How to create a vlan on a cisco switch mac#

If Host A sends a frame with a destination MAC address of Host B, that frame would still be flooded solely within the switch ports in VLAN #10. Similarly, in the second illustration, traffic in VLAN #10 cannot magically appear on VLAN #20 without also passing through a router.Д®ach of the VLANs also maintain their own, independent, MAC address table. In the first illustration, traffic from the red switch cannot magically appear on the orange switch without first passing through a router. Again, each VLAN operates as if it were a completely separate physical switch. Traffic arriving on a switch port assigned to VLAN #10 will only ever be forwarded out another switch port that belongs to VLAN #10 вЂ“ a switch will never allow traffic to cross a VLAN boundary. If a port is not explicitly assigned a VLAN number, it resides in the default VLAN, which has a VLAN number of 1. And lastly the two switch ports in the blue mini-switch might be assigned to VLAN #30.

The two ports in the orange mini-switch might be assigned to VLAN #20. For example, the two switch ports in the red mini-switch might be assigned to VLAN #10. After configuring IP address and default gateway for Management VLAN, you can telnet or SSH to the switch to perform switch management functions.Traffic flow through this topology operatesВ exactly as it did in the topology above it (with three separate physical switches).Д®ach virtualВ switch, or VLAN, is simply a number assigned to each switch port. 01(config)#ip default-gateway 192.168.100.1Дo remember to use the 'no shutdown' IOS interface mode command to bring the Management VLAN up. %LINK-5-CHANGED: Interface Vlan1, changed state to up 01>enableД®nter configuration commands, one per line. You must configure IP address and default gateway for Management VLAN.ДЇollow these steps to configure IP address and default gateway for Management VLAN. Cisco recommends not to use VLAN 1 and not to use any VLAN that carries user data traffic as Management VLAN. Normally the Management VLAN is VLAN 1, but you can use any VLAN as a management VLAN. Management VLAN is used for managing the switch from a remote location by using protocols such as telnet, SSH, SNMP, syslog etc.