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August 2005 - Posts

Wednesday, August 31, 2005 11:10 AM

Duplex Mismatch, CRC Errors or Output Errors

This is a common problem with Cisco. Many of their port cards are NOT autosensing. They hard-code to a specific speed and duplex. The autosensing ones allow you to set "auto" on the adapter, the others won't. If you plug an ethernet port that is hard
Posted by jahil | 0 Comments
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Tuesday, August 23, 2005 10:45 AM

Mainframe or Steelframe

A little more than five years ago (see " in the news ") IBM announced that it would begin installing and supporting the Linux operating system on its mainframe computers. A lot has happened with Linux and with mainframes since then, but first of all,
Posted by jahil | 0 Comments
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Saturday, August 20, 2005 4:16 PM

OSI Model 8,9,10 :)

The 7 layer model has often been extended in a humorous manner, to refer to non-technical issues or problems. A common joke is the 9 layer model, with layers 8 and 9 being the "financial" and "political" layers. Network technicians will sometimes refer
Posted by jahil | 1 Comments
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Saturday, August 20, 2005 11:29 AM

Cisco Clean Access Unauthenticated API Access

Cisco Clean Access (CCA) is a software solution that can automatically detect, isolate, and clean infected or vulnerable devices that attempt to access your network. CCA includes as part of the architecture an Application Program Interface (API). Lack
Posted by jahil | 0 Comments
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Sunday, August 14, 2005 4:27 PM

Dual Stack ( Protocol Redundancy )

I had just recently being playing with IPv6 on my network. Currently, the sustainable advantage we can get via protocol redundancy. The advantages of dual stacking is that you no longer depend on one protocol. If part of your network dies and takes out
Posted by jahil | 2 Comments
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Monday, August 08, 2005 10:50 AM

Creation and Configuration Virtual Routing and Forwarding (VRF)

In the last MPLS post , I discussed how to turn on MPLS service on the router and how to bind the labels to the IP packets. Today's post focuses on the creation and configuration of the Virtual Routing and Forwarding (VRF) delivered by Layer 3 MPLS VPNs.
Posted by jahil | 0 Comments
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Sunday, August 07, 2005 1:00 PM

Verification/Troubleshooting MPLS Basic

After configuring the routers to perform neighbor discovery and label/tag exchange the commands to verify that the process has completed successfully are as follows: Neighbor Verification TAG E3C2-GE6-0# show tag-switching tdp-neighbor MPLS E3C2-GE6-0#
Posted by jahil | 0 Comments
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Sunday, August 07, 2005 12:49 PM

Configuring MPLS Basic

In addition to MPLS theory, you must be able to configure the routers as well. The configuration can apply to customer edge routers, provider edge routers or provider routers. Each of these must be configured in order for MPLS to work within an enterprise
Posted by jahil | 2 Comments
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Sunday, August 07, 2005 12:23 PM

MPLS Engineer Interview

Last week during a telephonic interview by XYZ company, these questions were asked for the post of MPLS Inter-AS Engineer. I would like to publish some of the frequently asked questions by interviewers. Q. What is the purpose of a route distinguisher?
Posted by jahil | 4 Comments
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Saturday, August 06, 2005 2:14 PM

One year has passed!

I have been living in KSA ( Kingdom of Saudi Arabia ) for one year, 7 August 2004 when I emigrated from Lahore, Pakistan. One year ago, I was living with my family, friends and relatives with no word of Arabic :) I left my country in order to find more
Posted by jahil | 4 Comments
Wednesday, August 03, 2005 2:23 PM

Locating Problems in the Network

My network comprises several Cisco Catalyst® 6500 Series Layer 3 switches and many Catalyst 3500 Series Layer 2 switches. To quickly find the exact location and network port of a workstation that generates problems such as worms, viruses, or loss of connectivity,
Posted by jahil | 15 Comments
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Wednesday, August 03, 2005 11:20 AM

Ethernet Timeline

10 Terabit Ethernet: from 10 Gigabit Ethernet, to 100 Gigabit Ethernet, to 1 Terabit Ethernet Ethernet Timeline 10 Megabit Ethernet 1990* 100 Megabit Ethernet 1995 1 Gigabit Ethernet 1998 10 Gigabit Ethernet 2002 100 Gigabit Ethernet 2006** 1 Terabit
Posted by jahil | 1 Comments
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Tuesday, August 02, 2005 3:54 PM

Securing Cisco Router

I have had been actively involved with Cisco devices since last five-six years. The most interesting one is Router . Routers constitute the core components of most networks and, as such, securing the router platform should be the first step toward securing
Posted by jahil | 11 Comments
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Monday, August 01, 2005 9:58 AM

Pakistan Independence Day

Pakistani day is approaching fast and I would like to wish all of you a happy pakistan day. Pakistan our dear homeland,we got it after tremendous struggle,efforts & sacrifice..... AND NOW COME'S THE DAY WE CELEBRATE OUR INDEPENDENCE DAY....So have
Posted by jahil | 0 Comments
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