The Journey of a Network Engineer:

February, 2011

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February 28, 2011  7:58 AM

Troubleshooting Switch Stacks.



Posted by: Sulaiman Syed
3750, Cisco, detail, stack, switch, troubleshoot

So, today in the morning we received this entry in our syslog server: Feb 27 17:15:58: %STACKMGR-4-STACK_LINK_CHANGE:

February 27, 2011  7:41 AM

Errdisable Port State Recovery on the Cisco IOS



Posted by: Sulaiman Syed
Cisco, errdisable, ios, loopback, no shut, Port, recovery, shut

Ports in Cisco switches go into errdisable state for various reasons. some reasons are configured such as arp-inspection, bpdugaurd, psecure-violation, etc. While some are turned on by default such as loopback, link-flap, etc. Following the typical default configuration of cisco switch.  Once it...


February 23, 2011  5:29 AM

How to design transparent proxy?



Posted by: Sulaiman Syed
Cisco, design, in-line, network, PBR, proxy, router, transparent, WCCP

Almost every organization uses proxy. The benefits of proxy servers are countless. Some of these benefits are mentioned:

  • Add Accounting
  • Add Authorization
  • Reduce the load on the external (wan) link
When the proxy is installed in transparent setup. it...


February 22, 2011  1:04 AM

How to subnet?



Posted by: Sulaiman Syed
binary, CCNA, cheat sheet, Cisco, mathematics, subnet, subnetting

For any Network Engineer, knowing how to subnet is as important as typing " en " in the CLI. The engineer will have to type access lists that have wild masks, break networks to smaller parts, create vlans, point to point links, and design a whole new enterprise network. Subnetting is part of all...


February 15, 2011  7:53 AM

How to pass ITILv3 Foundation?



Posted by: Sulaiman Syed
Certification, exam, Foundation, ITIL, itskiptic, Pass, pdf

For many employees seeking to enhance their career in IT field the certification of ITIL is a very big added advantage. The question is, how to pass it? Questions such as, Do i need to take formal training for ITIL? How much ITIL foundation exam will cost? are valid that go through the...


February 10, 2011  4:44 AM

MPLS VPN tutorial



Posted by: Sulaiman Syed
Cisco, configuration, Dynamips, example, GNS3, MPLS, mpls vpn, tutorial, vpn

I would like to post a simple example of how to set up MPLS-VPN for two users. This example was used from the Cisco Press book CCIE Routing and Switching . Although the book...


February 9, 2011  8:16 AM

what is MPLS VPN?



Posted by: Sulaiman Syed
Cisco, how mpls vpn works, MPLS, mpls vpn, network, router, routing, service provider, virtual, virtual routing, vpn

When a service provider connects to sites that belong to one customer that uses private address then SP will advertise those routes within his autonomous systems. This could be handled when he is serving one ogranization. What if the SP is connecting 10 customers each with three sites and all of...


February 8, 2011  3:35 AM

How MPLS works?



Posted by: Sulaiman Syed
Cisco, how, how mpls works, ip, label, LDP, LFIB, MPLS, network, pop, push, QoS, tag, Unicast, works

MPLS protocol uses a different mechanism to forward packets. Packets are sent based on MPLS lable instead of the conventional packet's destination IP address. It add the ability to make forwarding decisions based on other factors beside the IP address, such as traffic engineering, QoS, and privecy...


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