Shulou(Shulou.com)06/01 Report--

In the cisco network, there are four main interface types of the switch in the final stable state in the local area network: access/ trunk/ multi/ dot1q-tunnel.

1. Access: mainly used to access terminal devices, such as PC, server, print server, etc.

2. Trunk: mainly used to connect other switches to carry multiple vlan on the line.

3. Multi: it carries multiple vlan in a single line, but unlike trunk, it does not label the data it carries. It is mainly used to access servers that support multi-vlan or some network analysis devices. Nowadays, such interfaces are rarely used, and such interfaces are basically not supported in cisco network devices.

4. Dot1q-tunnel: used in Q-in-Q tunnel configuration.

Cisco network devices support dynamic negotiation of the working status of ports, which provides some convenience for the implementation of network devices (but dynamic mode is not recommended). Cisco dynamic negotiation protocol has developed from DISL (Cisco private protocol) to DTP (public protocol). According to the implementation of the dynamic protocol, the Cisco network device interface is mainly divided into the following modes:

1. Switchport mode access: forces the interface to become an access interface, and can actively negotiate with the other party to induce the other party to become access mode.

2. Switchport mode dynamic desirable: the possibility of actively negotiating with the pair to become a Trunk interface. If the neighbor interface mode is one of Trunk/desirable/auto, the interface will become a trunk interface to work. If the trunk mode cannot be formed, it works in access mode. This mode is now the default mode of the switch.

3. Switchport mode dynamic auto: only when the neighbor switch actively negotiates with itself will it become the Trunk interface, so it is a passive mode, and when the neighbor interface is one of the Trunk/desirable, it will become Trunk. If the trunk mode cannot be formed, it works in access mode.

4. Switchport mode trunk: force the interface to become a Trunk interface, and actively induce the other party to become Trunk mode, so it will become a Trunk interface when the neighbor switch interface is trunk/desirable/auto.

5. Switchport nonegotiate: strictly speaking, this is not an interface mode, its function is to prevent the switch interface from sending DTP packets, it must be used with switchport mode trunk or switchport mode access.

6. Switchport mode dot1q-tunnel: configure the switch interface as a tunnel interface (non-Trunk) to form an asymmetric link with the Trunk interface of the subscriber switch

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