Have you been told that VLANs are the ultimate solution to your network woes? That they’ll magically secure your infrastructure, eliminate complexity, and solve all your traffic management headaches?

Virtual LANs (VLANs) allow the segmentation of a physical network into multiple logical networks. VLAN trunking is the process of transporting multiple VLANs over a single network link—typically ...

Since the late 1990s, the virtual local area network, or VLAN, has been a crucial component of modern network strategies. Prior to VLAN development, network engineers ...

号主：老杨丨11年资深网络工程师，更多网工提升干货，请关注公众号：网络工程师俱乐部 下午好，我的网工朋友。 我们都知道，网络工程师的工作离不开对交换机的熟练操作。华为交换机的配置，绝对是考验我们技术功底的重要一环。 今天聊点儿实在的 ...

1、为什么部分VLAN无法通过Trunk端口？ 部分VLAN无法通过Trunk端口，可能是用户未将相应的VLAN加入到Trunk端口。此外，本端设备Trunk端口的缺省VLAN ID和相连的对端设备的Trunk端口的缺省VLAN ID必须一致，否则报文将不能转发。出现该问题时，可以通过 display vlan 命令来 ...

为了使设备能够识别不同VLAN的报文，IEEE 802.1Q标准对Ethernet帧格式进行了修改，在源MAC地址字段和协议类型字段之间加入4字节的802.1Q Tag（又称VLAN Tag，简称Tag）。帧格式如图1-1所示。在Tag中有一个VID（VLAN ID）字段，用于表示帧所在的VLAN。并非所有设备都能识别 ...

It’s easy to see why virtual LANs have become popular on networks of all sizes. Imagine having multiple separate physical networks within a single organization — without the headache of managing ...

We are trying to evaluate feasibility of supporting switched-vlan:trunk-vlans defined under openconfig-vlan model on devices running Cisco IOS-XR. Configuration of trunk-vlans on Cisco devices require ...