The Journey of a Network Engineer:

vlan

1

December 14, 2011  12:26 AM

How to configure per-vlan QoS in Cisco 3550 and 3560



Posted by: Sulaiman Syed
3550, 3560, CCIE, Cisco, class-map, Configure, how, Lab, mark, nested policy, parent policy, per-vlan, police, policy-map, QoS, rate, switch, to, vlan

You might think that configuring QoS in Cisco Switches will follow the same syntax. That what I thought till i started studying CCIE. Let's See one major difference in how policing is implemented on these two platforms. Cisco Catalyst 3550 I find the configuration of 3550...

May 16, 2011  12:49 PM

What is the difference between M1 and F1 Cisco Nexus Line cards?



Posted by: Sulaiman Syed
access, ACL, Cisco, DCNM, distribution, F1, Fabric, FabricPath, forwarding, IPv4, IPv6, M1, M1-XL, MAC, Nexus 7000, security group tags, SGT, Unicast, vlan, VSAN

Cisco Nexus series switches brought a new technology to the data center. The whole designed is changed from the Catalyst 6500 series. Nexus is no longer dependent on SUP's backplane, it is more like a midplane architecture. Let me elaborate a little on this, what that statement means that...


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...


March 11, 2011  4:57 AM

Troubleshoot: distribution Switch acting wierd.



Posted by: Sulaiman Syed
3750, 6509, ASA, Cisco, extended ping, Firewall, lost connection, ping, routing, server fam, switch, traceroute, vlan, WLSM

Before i Begin, Lets not talk bout how bad the design is. I know all the issues with our design, and that it is faulty in every possible way. Lets say that I still don't have the managerial power to alter the design yet. The design will change, hopefully sooner than later. I'll explain how the...


December 26, 2010  3:45 AM

How to aggregate ports?



Posted by: Sulaiman Syed
Aggregation, Cisco, LACP, PAgP, Port, vlan

In many cases we would require higher bandwidth within the organization while we have 1GB uplinks, or we stack switches and want to have multiple uplinks from each switch, or just to keep redundant link that is unblocked by STP. All these are simple scenarios that we face and the solution is...


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...


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....


October 1, 2010  10:55 AM

Policy Based Routing – Part 2



Posted by: Sulaiman Syed
access, ACL, based, list, map, PBR, policy, route, routing, vlan

In Policy Based Routing - part 1 I have explained why and how we can use PBR in production environment. Today, i shall post...


1

Forgot Password

No problem! Submit your e-mail address below. We'll send you an e-mail containing your password.

Your password has been sent to: