Two-tier Business VLAN mapping & dot1q Tunnel

In the two-layer network, when transmitting two beginning, it needs to be forwarded with the outer VLAN of the message, while the outer tag of the user network is usually inconsistent with the VLAN of the carrier network, so the VLAN stacking and VLAN mapping and dot1q tunnel etc. Unlike VLAN stacking, VLAN mapping replaces the user's outer VLAN with the carrier's VLAN, and then reverts to the original VLAN when it leaves the carrier's network, but the VLAN mapping and VLAN stacking are not significantly different.

Today is to introduce the dot1q tunnel function, after configuring this function, for incoming messages, is to hit a layer of designated VLAN, and then leave the carrier network when the layer of the VLAN stripped. Unlike the Dot1q tunnel, which can be used to transmit UNTAG messages (that is, messages without VLANs), even Vlan0 and 4095 of messages can traverse the carrier network. In contrast, VLAN dot1q tunnel is more powerful.

This article is from the "11798847" blog, please be sure to keep this source http://11808847.blog.51cto.com/11798847/1828210

Two-tier Business VLAN mapping & dot1q Tunnel