Routing:
[Gen][CCNA][CCNP Route][CCNP Remote][CCDA][MPLS][EEM][Add][Juniper][ACL][Host]
Switching: [CCNP Switch] [Switch Add] [Intro] [VLANs] [MLS] [STP] [QoS] [Availability] Security: [CCNP Security] [CCNA Security] [CCNP ISCW][PIX] [Adv PIX/ASA] [Net Sec1] [Net Sec2] Wireless: [Wireless] [Wireless Chall] [CCNA Wireless] [Wireless Theory] Voice: [Voice/QoS] [CCNA Voice] [CCVP Gateway] [CCVP Voice] Topics: [Dot1q][Dot1x][BGP][BRI][DHCP][IGRP][IGMP][OSPF][PPP][QoS][RADIUS][RIP][Subnet][SNMP][VLAN] IEEE 802.1Q (Dot1q)Nodes within a VLAN can directly communicate with each other, nodes which are outside the VLAN cannot communicate directly - even though they connect to the same switch. But, what it we have nodes which connect in the same VLAN, but connect to different switches? Well, this is where we use IEEE 802.1Q (Dot1q). With this we can add a VLAN tagging to Ethernet frame, and which can then be forwarded to other switches for them to pick up the VLAN information. In this way, we can keep the communications at Layer 2. CCNA
CCNP Switch
Wireless
CIP
To configure the trunk port for the 1Q communications, we assign one of our ports on the VLAN to a VLAN number and then enable the trunk protocol. In the example below, we assign FA0/1 (the port on the network switch) to be out VLAN trunk port, and add it to VLAN number 3: > enable # config t (config)# int vlan 3 (config-vlan)# exit (config)# int fa0/1 (config-if)# switchport access vlan 3 (config-if)# switchport mode dot1q-tunnel (config-if)# exit (config)# vlan dot1q tag native |