Qinq tunneling allows the user to create a layer 2 ethernet connection between two servers. In this topology, 2 cisco catalyst 295024 switches and 6 pcs are used. Your contribution will go a long way in helping us serve. Vlan ids konnen bei verschiedenen kunden mehrfach verwendet werden. The protection switching may be triggered by manual operation or by cfm information. To configure a port channel as an asymmetrical link, all ports in the port channel must have the same tunneling configuration. In this service provider network, there are multiple customer vlans mapped to one service vlan. Qinq or vlan stacking are common terms used by todays telecom operators which are the same thing. In qinq tunneling, as a packet travels from a customer vlan cvlan to a service providers vlan, a customerspecific 802. Layer3 vlans q also known as virtual subnet q vlan membership implied by maclayer protocol type field and subnet field 123.
In actual applications, however, a large number of vlan are required to isolate users, especially in metropolitan area networks mans, and 4,094 vlans are far from satisfying such requirements. In this part we will explain access link, trunk link, vlan tagging process, vlan tagging protocol isl and 802. The technique is also known as provider bridging, stacked vlans, or simply qinq or qinq. A typical qinq network is composed of a service provider network tier 1 where each node connects to a customer network tier 2. After that we will configure trunking in our practice lab. Tag frames specify the vlan for which trunk ports process packets. This additional tag is used to segregate traffic into serviceproviderdefined service vlans svlans. By using a different vlan tag for each customer we can separate. This tag increases the size of an ethernet frame, from its default of 1514 bytes to 1518 bytes. Understanding vlans, trunk, native vlan and router on a. Vlan configuration commands step by step explained. This allows the use of svlan member ports for qinq tunneling, while. The user can segregate a different vlan traffic on a link or bundle different vlans i. The qinq mixed vlan mode configuration supports both cvlan and.
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