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March 22, 2011  7:30 AM

Configuring IP DHCP Snooping.



Posted by: Sulaiman Syed
binding, Cisco, configuration, dhcp, ip, mode, option 82, snooping, switch, transparent, vlan, vtp

The other day, a smart user (i consider him evil) attached a ADSL modem to the network port. What he didn't realize that his device was programmed to work as DHCP server. As a result, the whole vlan started getting the wrong IP address, and connectivity was lost. After investigation, we realized a...

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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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December 7, 2010  2:59 AM

How to use IP Prefix List?



Posted by: Sulaiman Syed
access, CCNP, Cisco, ip, list, map, network, route, subnet

IP prefix list mostly used with route filtering in IGP (OSPF, IS-IS, EIGRP) and EGP (BGP) protocols. At first sight, the command will look confusing, but it is pretty simple and straight forward. Prefix list can be used with route map, and they would be referred...

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October 27, 2010  3:46 AM

From trunk ports to routed ports – part 2



Posted by: Sulaiman Syed
access, Cisco, core, design, distribution, ip, network, routed, scheme, subnet, trunk, vlan

In this part, I would talk bout the migration from current network, to the proposed network. Figure 1 shows a core layer with two distribution layer, the one on the left is current, and the one on the right is the proposed. Before explaining any further, take note that although user vlans were...

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