How to Configuring Point-to-Point Serial Interfaces

The point-to-point serial link is a little different than the Frame Relay serial link. As you recall, Frame Relay is used in many cases in a point-to-multipoint environment. To create a point-to-point connection between two routers, you can use other types of WAN encapsulations, such as HDLC, PPP, and SLIP. For a complete review of these encapsulations, refer to Chapter 11 of the ICDN book. We will use the default serial encapsulation, which is HDLC. For two serial interfaces to communicate, you must provide the clock rate. The clock rate provides bit synchronization and has other uses that are beyond the scope of this chapter's purposes. The device that provides this clock rate is the data circuit-terminating equipment (DCE). The...

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How to configure VTP Pruning

Introduction As you would be aware a switched network creates one broadcast domain, similar to that of a VLAN powered network where all nodes belonging to the same VLAN are part of the same broadcast domain, receiving all broadcasts sent on their network. The Broadcast And Unicast Problem In VLAN Networks What we are about to see is how these broadcasts can actually create problems by flooding the VLAN network with unnecessary traffic, and depending on your network setup, this can prove to be a huge problem. The reason for this is because the trunk links interconecting your network switches will carry these broadcasts to every switch in the network, regardless of which VLAN the broadcast is intended for.   As shown...

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VLAN and VTP configuration

Lab instructions The aim of this lab is to check your ability to configure VTP and VLAN on a small network of four switches. This lab will help you to prepare your ICND1 exam. 1.Configure the VTP-SERVER switch as a VTP server2.Connect to the  3 other switches and configure them as VTP clients. All links between swiches must be configured as trunk lines.3.Configure VTP domain name as "TESTDOMAIN" and VTP password as "cisco"4.Configure VLAN 10 with name "STUDENTS" and VLAN 50 with name "SERVERS"5. Check propagation on all switches of the VTP domain. Network diagram   Solution Configure the VTP-SERVER switch as a VTP server VTP-SERVER(config)#vtp mode server Verify the VTP configuration using the "show vtp status command" VTP-SERVER#show...

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Cisco VTP VLAN Trunking Protocol

  Cisco VTP VLAN Trunking Protocol (VTP) is a Cisco 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. VTP is a Cisco-proprietary protocol that is available on most of the Cisco Catalyst Family products. VTP ensures that all switches in the VTP domain are aware of all VLANs. There are occasions, however, when VTP can create unnecessary traffic. All unknown unicasts and broadcasts in a VLAN are flooded over the entire VLAN. All switches...

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How to configure Trunking between VLANs with ISL?

Trunking is a technique to carry different VLAN traffic using point to point link between two devices. ISL (InterSwitch Link) is a cisco proprietary protocol can work with Ethernet token ring and Fddi also. Trunking changes the formatting of the packets. The ports need to be in agreement as to which format is being use to transmit data on the trunk, if there is different trunking encapsulation on the two ends of the link they will not able to communicate. Similar situation will occur if one of your ports is configured in trunking mode and other one as in access mode. First create multiple VLANs with name, assign multiple ports to them then create...

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How to configure Trunking between VLANs with 802.1q?

Trunk link is used to carry the different VLANs traffic on a single link. There are two different protocols are used for Ethernet trunking, 802. 1q and ISL. Trunking change the formatting of the packets. The ports need to be in agreement as to which format is being use to transmit data on the trunk, if there is different trunking encapsulation on the two ends of the link they will not able to communicate. Similar situation will occur if one of your ports is configured in trunking mode and other one as in access mode. First create multiple VLANs with name, assign multiple ports to them then create 802.1q trunk link between the two switches to allow ...

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How to configure VTP Client and Server?

VTP (VLAN Trunking Protocol) is the protocol that propagates the information about which VLANs exist from one switch to another switch. If VTP did not provide this information, VLANs would have to be created on all switches individually in the network.VTP is a Cisco proprietary protocol. The default mode of a switch is configured as VTP server. In any case, the server services are turned off, use the following command to turn it back on as VTP server.     SwitchA#vlan database    SwitchA(vlan)#vtp server    SwitchA(vlan)#exitFirst create multiple VLANs with name, assign multiple ports to them then create 802.1q trunk link between the two switches to allow communication between VLANs. To ...

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