Vlan

Overview This document describes a method for simulating multiple servers belonging to different network domains on a single Linux host. Each simulated server runs inside its own Linux network namespace and is connected to a dedicated VLAN. Training and demonstration environments Each namespace behaves as an independent server with: Its own IP address Its own MAC address An SSH service A simple HTTP server Network Topology The Linux host uses the following interfaces: ...

L2VPN pseudowire (PW) behavior differs between vendor platforms and device models, particularly around how VLAN tags are handled. Understanding the differences between VC type 4 (VLAN-based) and VC type 5 (Ethernet port-based) pseudowires, and the interoperability gotchas between EVC-based and non-EVC platforms, is critical when building multi-vendor L2VPN networks. L2VPN Packet Structure The basic structure of a packet traversing an L2VPN pseudowire is: Tunnel header + VC label + Control Word + L2 PDU Control Word The control word is a 4-byte field inserted between the VC label and the L2 payload. In Cisco IOS/IOS XR, the control word is enabled by default. ...