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Saturday, 26 January 2013

Installing WLC 7.4 on an ISM-SRE-300-K9

I had the honour of configuring a WLC on a ISM-SRE-300 recently. Normally when you order these as a bundle they come with the software and licences on it. Mine came with Cisco Unity Express, which is quite useless for running Lightweight AP's (LWAP). I therefore had to build it from scratch.

My starting point was the following document:

The first thing to do is configure the service module, with some IP connectivity so the WLC software can be loaded onto it (using FTP).

The service module comes with 2 interface: ISM0/0 and ISM0/1.    The ISM0/0 interface is used for the installation of the actual WLC software.  ISM0/1 is used for the operation of the actual WLC once it is installed. It is the internal switch interface to the internal service module. For the software installation, only ISM0/0 needs to be configured.

The ISR Gen2 routers have what is called Multi Gigabit Fabric, it is in essence a switch within the router that allows the various additional modules to intercommunicate, without requiring Router CPU resources. 

In this particular case, interface Gi0/0 (actually configured as a trunk) connects the router to the rest of the network and towards the FTP server. 

interface GigabitEthernet0/0.100
 description ***DATA VLAN 100***
 encapsulation dot1Q 100
 ip address

interface ISM0/0
 ip unnumbered GigabitEthernet0/0.100
 service-module ip address
 service-module ip default-gateway

interface ISM0/1
 description Internal switch interface connected to Internal Service Module
 switchport mode trunk
 no ip address

Test connectivity, by pinging the service module from the FTP server.

At this stage you should download your required WLC  version software from Cisco and Unzip it into the desired folder of your FTP server.

url ftp://cisco:cisco@
Delete the installed Cisco Unity Express and proceed with new installation? [no]: yes
Loading AS_SMWLC_7_4_100_0.aes.install.sre !
[OK - 2819/4096 bytes]
Welcome to WLC installation checking resource requirements now
Resource check complete proceeding with installation

This will start of the installation (as you can see my ISM had CUE on it).

It will end with the option to auto configure.  I will leave all that stuff for later



  1. Hi Dennis, I am a newbie to this environment and have a same lab testing. I want to configure wireless Lan controller on a 2901. I have configured all the interface and can session onto the sre sm where i did necessary configurations. The trouble I have is that when I to bring up the GUI (https://[ip], why is it not taking the username I have configured, is the a default username?

    Please not that I have not installed the wlc application

  2. is it throwing you an message saying user ID/password are incorrect, or are you not getting to the connected to the URL at all?