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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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October 31, 2010  2:39 PM

From trunk ports to routed ports – part 3



Posted by: Sulaiman Syed
access, Cisco, client, configuration, core, design, distribution, network, routed, switch, trunk, vtp

This is the final part of the series. In this blog entry, I would post the sequence and the configuration lines that are needed to be done in order to have smooth transition from trunk ports to routed ports. The

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October 15, 2010  12:21 PM

Issues with VTP



Posted by: Sulaiman Syed
access, Cisco, issue, switch, trunk, vlan, vtp

Although Vlan Trunking Protocol does its job in distributing vlan database from server to all the other client switches.  It has some major issues when wrongly implemented or trunk negotiation between switches. 1- Always reset the revision number of a switch before adding to production network....

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