Author Archives: Humair
Cisco Port Security with Dynamic MAC Address Learning
In this lab I used a Cisco Catalyst WS-C3560G-24TS switch [IOS Version 12.2(40)SE]. Using Cisco Port Security it is possible to associate a static MAC address to a physical port on a switch. This only allows one host with that … Continue reading
Posted in Cisco, Labs, Networking, Technology
Tagged Cisco, Cisco Catalyst 3560 switch, Cisco Catalyst WS-C3560G-24TS, Cisco Port Security, Cisco Port Security with Dynamic MAC Address Learning, Dynamic Port Security, MAC address, Port Security, router, switch, switchport port-security, switchport port-security violation
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How to Fix – Force10 S4810 Switch Stuck in Boot Loop
In this blog I discuss how to fix a common boot loop problem. A boot loop can occur if you change the boot variables for a switch and accidentally put in incorrect information. You may also make a typo when … Continue reading
Posted in Force10 Networks, Networking, Technology
Tagged boot loop, boot variables, Force10, Force10 S4810, FTOS, S4810, TFTP
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pNIC, vNIC, and vmNIC Confusion
I have been using both remote desktop and vSphere Client quite often lately. Yesterday, I had a remote desktop session with a Windows Server 2003 physical server and also had vSphere Client (connected to an ESXi server) open with a … Continue reading
Functionality of Layer 2 Switches/Bridges
Layer 2 switches and bridges switch frames on a network while layer 3 routers route packets between networks. I once heard a network engineer being asked if a network can be made faster if the network is optimized to use … Continue reading
Posted in Networking, Technology
Tagged Address Learning, application specific integrated circuits, ASICs, bridges, bridging technologies, broadcasts, Cisco, collision domain, collision domains, datalink layer, filter table, Forward/Filter Decisions, frame, frame filtering, frames, layer 2 broadcasts, Layer 2 Switching, Loop Avoidance, MAC, MAC address, MAC address table, MAC database, Media Access Control, Media Access Control Address, multicasts, network, network layer, network loops, networking, packet, packets, routers, slow convergence, Spanning Tree Protocol, STP, switches, switching
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Facebook Hack – How “shared” is your website on Facebook?
In this blog I describe a cool little data mining hack you can use to determine how “shared” a specific website is on Facebook. Let’s say you want to determine how often the “http://www.cnet.com” site has been “shared” on Facebook. … Continue reading
Posted in Data Mining, Hacks, Social Networking, Technology
Tagged Facebook, Facebook Hack, Facebook Shares, hack, shares, website shares
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Setup SSH Access on Cisco Switches
The Cisco Catalyst WS-C3750G-24TS [IOS 12.2(25)SEE3] switch provides both layer 2 and layer 3 functionality. In this lab I’m going to demonstrate how to setup SSH access to the switch. The first thing I do is set a hostname and … Continue reading
Posted in Cisco, Labs, Networking, Technology
Tagged Catalyst, Cisco, Cisco Catalyst 3570, Cisco Catalyst WS-C3750G-24TS, default route, router, SSH, switch
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VMware vSphere 4 Step-through
VMware vSphere is an industry leading virtualization platform. Basically it is a software suite composed of applications directed towards managing datacenters through the use of virtualization technology. I’m going to briefly discuss some of the major/core components of vSphere 4. … Continue reading
Posted in Technology, Virtualization and Cloud Computing
Tagged Cisco Nexus 1000V, Cloud Computing, Consolidated Backup, Distributed Resource Scheduler, enterprise level virtualization, enterprise virtualization, ESX, ESXi, Fault Tolerance, High Availability, Hot Add, hypervisor, SMP, Storage VMotion, Thin Provisioning, vCenter Orchestrator, Virtual Symmetric Multi-Processing, VirtualCenter, virtualization, VMDirectPath, vMotion, vmware, VMWare ESX, VMware ESXi, VMware vSphere, vNetwork Distributed Switch, vShield Zones, vSphere, vSphere 4
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Setup Telnet Access on Force10 Switches
I am going to use a Force10 S60 switch [FTOS 8.3.3.4] to demonstrate how to setup telnet access. To setup telnet access you first need to set an IP address on either a data port or a managment port so … Continue reading
Posted in Force10 Networks, Labs, Networking, Technology
Tagged Force10, Force10 Networks, mamangement port, managementethernet, router, S60, switch, telnet
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Creating a Link Aggregation Group (LAG) in FTOS
This lab demonstrates how to create a Link Aggregation Group (LAG) in FTOS on Force10 switches. A LAG in Force10’s FTOS is called a port channel and in Cisco’s IOS is called an EtherChannel. As described by IEEE 802.3ad, LAG … Continue reading
Posted in Force10 Networks, Labs, Networking, Protocols, Technology
Tagged dynamic port channel, etherchannel, Force10, Force10 Networks, Force10 S25P, Force10 S50V, FTOS, IEEE 802.3ad, LACP, LAG, Link Aggregation Control Protocol, Link Aggregation Group, port channel, router, S25P, S50V, static port channel, switch
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