The Journey of a Network Engineer:

May, 2011


May 30, 2011  4:35 AM

GRE Tunnel ARP entry never times out! – part 2

Posted by: Sulaiman Syed
6500, AP, ARP, Cisco, GRE, mn, SUP720, Tunnel, wireless, WLSM

I have been trying to figure out why the APR entries don't timeout as they should do naturally from the tunnels. As it seems, the natural time of 4hr is...

May 24, 2011  5:56 AM

GRE Tunnel ARP entry never times out! – part 1

Posted by: Sulaiman Syed
6500, AP, ARP, Cisco, dhcp, GRE, Tunnel, wireless, WLSM

I would like to clear the ARP entries automatically from the GRE tunnel made by the WLSM to the AP. here are the configurations of the tunnels.

interface Loopback1 description tunnel_source ip address 10.x.x.1

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May 22, 2011  5:07 AM

How to troubleshoot EIGRP?

Posted by: Sulaiman Syed
Cisco, neighbor, operation, process, protocol, router, switch, topology, troubleshoot

In the previous entry I explained how EIGRP is configured. I would like to follow on that, how to check the operation of EIGRP, and the commands...

May 20, 2011  12:01 PM

How to congifure EIGRP?

Posted by: Sulaiman Syed
Cisco, Configure, how, IGRP, neighbor, router, switch

EIGRP is a Cisco proprietary protocol. It is one of the most widely used within enterprises that use Cisco switches/ routers. It stands for Enhanced Interior...

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...

May 12, 2011  2:47 AM

Nexus 7000 Vs Catalyst 6500 (Backplan capacity)

Posted by: Sulaiman Syed
6500, backplan, Bandwidth, capacity, Catalyst, Cisco, Fabric, Line Module, Module, Nexus, Nexus 5000, Nexus 7000, Sup, SUP720, Supervisor Engine, switch

Cisco has introduced Nexus. Nexus are the new line of data center switches. They come in the variables of 7000, 5000, 2000, and lastly 1000. Nexus 7000 with their...

May 5, 2011  3:53 PM

Solved: Distribution Switch Acting Weird

Posted by: Sulaiman Syed
cisco 6509, client, configuration, core, distribution, routing, server, server farm, switch, vtp pruning

In my previous entry of "

May 1, 2011  5:20 AM

Solving the stackwise problem in Cisco Catalyst 3750.

Posted by: Sulaiman Syed
3750, Cisco, configuration, Master, Slave, stack, switch, troubleshoot

In our previous


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