IPv6 Tutorial: The overview

January 19th, 2011 Wael Osama Posted in IPv6, What Is ? 15 Comments »

I will start from the beginning; two weeks ago I wrote a post claiming that IPv4 is depleting and IPv6 is coming soon; and since we are considering deploying IPv6 soon in our network, I thought it might be useful to write about IPv6 migration and transition strategies. Although, this is important but I think […]

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What is MPLS? – MPLS Tutorial

March 31st, 2010 Wael Osama Posted in MPLS, What Is ? 7 Comments »

What is MPLS? MPLS stands for Multi-protocol Label Switching. MPLS is a packet forwarding technology that is capable of carrying any L3 protocol and here comes the word multi-protocol. MPLS is capable of tunneling L3 packets inside the MPLS network usingĀ  MPLS labels. The MPLS label is pushed into the packet between the layer two […]

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What is LDP extended discovery?

January 10th, 2009 Wael Osama Posted in MPLS, What Is ? 5 Comments »

Normally LDP neighbors are found automatically by sending UDP Hello packets on Port 646 with the destination of multicast address out of each LDP enabled interface. In some MPLS applications a LDP session must be established between non directly connected peers to exchange labels. In such cases Hello packets can not be just broadcasted, […]

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What is Integrated ISIS?

November 5th, 2008 Wael Osama Posted in ISIS, What Is ? No Comments »

The IS-IS Routing Protocol may be used as an IGP to support IP as well as OSI. This allows a single routing protocol to be used to support pure IP environments, pure OSI environments, and dual environments. Integrated IS-IS is deployed extensively in an IP-only environment in the top-tier Internet service provider (ISP) networks. The […]

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What is: a voice VLAN port?

October 2nd, 2008 Wael Osama Posted in What Is ? No Comments »

A voice VLAN port is an access port attached to a Cisco IP Phone, configured to use one VLAN for voice traffic and another VLAN for data traffic from a device attached to the phone. This feature allows the switch to use CDP for sending configuration options regarding COS, Voice VLAN and data VLAN to […]

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What is: BPDU filter?

August 23rd, 2008 Wael Osama Posted in Bridging & Switching, What Is ? 3 Comments »

BPDUs are the messages exchanged between switches to calculate the spanning tree topology. BPDU filter is a feature used to filter sending or receiving BPDUs on a switchport. It is extremely useful on those ports which are configured as portfast ports as there is no need to send or receive any BPDU messages on of […]

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