VLAN

1. The character and excellency of VLAN

This point ,I was written in the VLAN’s origin and knowledge, So I don’t repeat!

2.The create VLAN membership

There are two types of VLAN port configurations: static and dynamic.

a. Static: VLAN division is based in accordance with the port. When a member of the network to enter, it will automatically become the port of their VLAN. In other words, if a member wants to maintain the position but it was the identity of the VLAN, then the administrator must be manually set.

b. Dynamic: VLAN membership is based on the MAC address of the equipment to set up, when the device into the network, it will query the database to its VLAN membership. He CISCOWORK2000 can be achieved.

Static VLAN settings, VLAN on the switch is set up to achieve, and now there are two switches, one is based on IOS, a SET is based on the way.

With VLAN Membership Policy Server (VMPS), you can assign switch ports to VLANs dynamically, based on the source Media Access Control (MAC) address of the device connected to the port. When you move a host from a port on one switch in the network to a port on another switch in the network, the switch assigns the new port to the proper VLAN for that host dynamically.

The VLAN Management Policy Server (VMPS) service is used to set up a database of MAC addresses that can be used for dynamic addressing of VLANs. VMPS is a MAC-address-to-VLAN mapping database.

Catalyst 2900 and 3500 Series XL Features include VMPS.

VMPS is present on all Catalyst 5000 Family switches.

. which of the following guidelines is not necessary when configuring dynamic vlan —– election 4
1. Configure vmps server
2. Turn off trunking on the port
3. Turn off 802.1x port security
4.configure the spanning-tree portfast feature

The following is the original words on a Cisco Academy of teaching materials

VMPS must be configured before ports can be set as dynamic.
The VTP management domain of the VMPS clients and the VMPS server must be the same.
The management VLAN of VMPS clients and the VMPS server must be the same.
When a port is configured as dynamic, the spanning-tree Port Fast feature is automatically enabled for that port.
After a static port is converted to dynamic on the same VLAN, the port connects immediately to that VLAN until VMPS checks its database for the legality of the specific host on the dynamic port.
Static ports cannot become dynamic ports.
Static ports that are trunking cannot become dynamic ports.
Physical ports in an EtherChannel cannot be configured as dynamic ports.
VMPS shuts down a dynamic port when too many active hosts connect to a port.

3. VLAN ID

Park in the network, users can be assigned to the Internet across a number of switches VLAN group, in this case. In this case, the switch can be used to identify a frame which belong to the VLAN approach to these data frames directed to the appropriate ports.

1. The type of link

①. In the exchange of environment, there are two links: access link and trunk link

②. Access Link: connection is a member of the VLAN link. VLAN known as the local VLAN. Connected to a member of the VLAN does not know the existence of VLAN. Because the switch in the frame to be sent to the device before the end of the VLAN information will be removed from the frame.

③. Trunk link: link roads that can carry multiple VLAN. When the main road link in the received frame, the switch must have a method to identify the frame which belong to the VLAN. Now use the logo of the technology package which ISL/IEEE802.1Q standard configuration.

④. Hybrid link: the link is either on-frame logo, but also non-frame-Logo.

2. VLAN frames marking method

①. Switch Link (ISL), for a number of Internet switches CISCO unique package deal. The agreement in the CATALYST switches and routers supported.

②. 802.1Q. An IEEE standard, it is inserted through a header in the VLAN identifier to achieve.

③. LANE. Through ATM for a way to transfer VLAN

④. 802.10. The standards used in the 802.10 that is FDDI transmission VLAN information within a proprietary method of CISCO.

Several frame size

802.1q frame size —- 1522 byte (using tag-ching, just over 802.3 Ethernet-ching, a large 4byte)
isl frame size —- 1548 byte (re-use of packaging than the 802.3 Ethernet standard by Tai-ching 30byte)
802.3 frame size —– 1518 byte

LANE - LAN Emulation - An IEEE standard method for transporting VLANs over Asynchronous Transfer Mode (ATM) networks.

ISL - A Cisco Proprietary encapsulation protocol for interconnection multiple switches.

802.1Q - An IEEE standard method for identifying VLANs by inserting a VLAN indetifier into the frame header. This process is called frame tagging.

802.10 - A Cisco Proprietary method of transporting VLAN information inside the standard 802.10 frame (Fiber Distributed Data Interface [FDDI]).

On an IEEE 802.1Q trunk port, all transmitted and received frames are tagged except for those on the VLAN configured as the native VLAN for the port. Frames on the native VLAN are always transmitted untagged and are normally received untagged.