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Challenges and Implementation of VLAN and Redundancy in LAN

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Added on  2019-09-21

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This article discusses the challenges faced in LAN due to a single broadcast domain and lack of redundancy. It proposes the implementation of VLAN and redundancy using Spanning Tree and HSRP protocols. Sample configurations and supporting tables are included. The article is based on the Cisco Official Certification Guide for CCNA Routing and Switching by Wendell Odom.

Challenges and Implementation of VLAN and Redundancy in LAN

   Added on 2019-09-21

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Site “XXX” Challenges and ImplementationSite details and ChallengesReduce Broadcast domain using Vlan and Implementation of redundancy in LAN.Currently network design is in one broadcast domain, so there is speed slow issues and high latency in network. Current network design has no redundancy due to this, if one device or one link goes down then all end user not able to access network.Site Solution and Technologies1)To reduce broadcast domain, need to implement vlan in LAN. Currently there is one vlan which means one broadcast domain. So I am going to create 3 vlan for this scenario, one broadcast domain is going to break in 3 broadcast domain, so network perform will be efficient. Vlan details as mention below.2)Currently, there is no redundancy in network in terms of devices and links. There is one Layer-3 switch as backbone of network and there is one link use for connectivity between Layer-3 switch and Layer-2 switches. I am going to implement redundant Layer-3 switch andring network architecture. Need to configure Spanning tree for redundancy of Links and HSRP for redundancy of Devices.Spanning tree protocol design for loop prevention in network, now it used beyond loop prevention as redundancy. STP detect look using BPDU packet. Switch send BPDU packet out of all interface and when the switch get the packet back, switch consider loop in network and block that port where BPDU received.Sample ConfigurationBasic configurationswitch(config)#hostname XXXXXX(config)#banner motd ^AUTHORIZED ACCESS ONLYIf you are not authorized to access then disconnect immediately.^XXX(config)#banner login ^AUTHORIZED ACCESS ONLY ^
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