Bitmindframes cisco study guides
INTERVLAN ROUTING
A VLAN is a broadcast domain and unique ip subnet
Switches operate at layer2 (Data link Layer)
VLANS cannot communicate without L3 (Network Layer)
The L3 communication is called inter-vlan routing
Inter-vlan routing is a process of forwarding network traffic from one vlan to another using a router
The Subnets of your network facilitate the routing process.
Router interfaces can be connected to separate vlans.
Devices on vlans send traffic through the router(L3) to other vlans.
Traditionally vlan routing required multiple interfaces.
Each interface was connected to a separate switch port & configured with a different subnet
The switch port is connected to the router in access mode.
Read the rest of this entry →
Tags: study, 802.1q, vtp, router, cisco, guides
Bitmndframes cisco study guides
DTP Dynamic Trunking Protocol
Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP), which is a Cisco proprietary Point-to-Point Protocol.
These various modes are configured using the switchport mode interface command
Switch trunk interfaces support different trunking modes.
- Access
- Dynamic desirable (default mode on Catalyst 2950 and 3550)
- Dynamic auto
- Trunk
- Non-negotiate
- dotq-tunnel (Not an option on the Catalyst 2950.)
Read the rest of this entry →
Tags: wan, cisco, switch, vtp, 802.1q, ip
Bitmindframes study guides
What is VTP?
VLAN Trunking Protocol (VTP) is a Cisco proprietary Layer 2 messaging protocol that manages the addition, deletion, and renaming of VLANs on a network-wide basis. Virtual Local Area Network (VLAN) Trunk Protocol (VTP) reduces administration in a switched network. When you configure a new VLAN on one VTP server, the VLAN is distributed through all switches in the domain. This reduces the need to configure the same VLAN everywhere. To do this VTP carries VLAN information to all the switches in a VTP domain. VTP advertisements can be sent over ISL, 802.1q, IEEE 802.10 and LANE trunks. VTP traffic is sent over the management VLAN (VLAN1), so all VLAN trunks must be configured to pass VLAN1. VTP is available on most of the Cisco Catalyst Family products.
Read the rest of this entry →
Tags: ip, guides, interface, switch, wan, router
Bitmindframes cisco study guides.
TRUNKING
Trunking is Point to point link from a switch to a router or a switch. A trunk link can carry traffic from multiple vlans over a single link allowing vlans to span internetworks.
Cisco supports IEEE 802.1Q trunking on 100/1000 ethernet
What does trunking solve?
Without trunking switches & routers have to be interconnected with a separate link for each VLAN. 4 VLANs require 4 links connecting switches S1 & S2 leaving fewer ports for devices. If S2 was connected to S1 it would be more than 4 ports.
Read the rest of this entry →
Bitmindframes cisco study guides.
VLAN’s are a very useful tool in an enterprise network,they segment each departments data using a single switch and trunking.
Here we will discuss the basics of VLAN’s in a cisco internetwork.
A VLAN is a logically separate IP subnetwork. VLANs allow multiple IP networks and subnets to exist on the same switched network. The figure shows a network with three computers. For computers to communicate on the same VLAN, each must have an IP address and a subnet mask that is consistent for that VLAN. The switch has to be configured with the VLAN and each port in the VLAN must be assigned to the VLAN. A switch port with a singular VLAN configured on it is called an access port.
Read the rest of this entry →
