If a switch receives a frame (a piece of data) from a certain port, it will identify that as belonging to a certain VLAN, because each port is assigned a certain port.
In a trunk link, additional data is added to each frame (frame tagging), to identify to which VLAN each frame belongs.
A tag added to each frame's header.
switch(config)#int type <no> switch(config-if)#switchport mode trunk switch(config-if)#switchport trunk allowed vlan all/vlan no switch(config-if)#exit switch(config)#exit switch#
VLAN 1 is the management VLAN. All switch ports are members of VLAN1.
the switchport access vlan 99 command is used to designate a specific VLAN for a switch port, allowing you to control how traffic on that port is treated and segregated from traffic on other ports and VLANs in the network. This is a fundamental configuration step in building and managing VLANs within a network infrastructure.
VLAN stands for Virtual LAN. It is called as such because you are essentially creating "virtual" networks on the same physical piece of hardware. Imagine a network switch with 20 ports. You could assign the first 5 to VLAN1, the next to VLAN2, and so on. You would end up with 4 segregated networks, but on the same physical switch. The virtual in VLAN is referring to the fact that there is nothing phsically separating the ports on the switch, it is done "virtually".
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VLAN
NVRAM
no vlan XXX copy run star
1) reset the revision number before installing. 2) have a backup switch with existing VLAN data.
A VLAN is a virtual LAN. In technical terms, a VLAN is a broadcast domain created by switches. Normally, it is a router creating that broadcast domain. With VLANs, a switch can create the broadcast domain. This works by, you, the administrator, putting some switch ports in a VLAN other than 1, the default VLAN. All ports in a single VLAN are in a single broadcast domain. Because switches can talk to each other, some ports on switch A can be in VLAN 10 and other ports on switch B can be in VLAN 10. Broadcasts between these devices will not be seen on any other port in any other VLAN, other than 10. However, these devices can all communicate because they are on the same VLAN. Without additional configuration, they would not be able to communicate with any other devices, not in their VLAN.
Switch is faster than HUB. If you are using managed switch you can create VLAN, you can secure ports and many other things.
force the port to be a part of a single vlan