Recently I purchased a nice new Cisco 867w as I needed another router, and it didn’t really warrant the expense of an 887w or larger for the task at hand. I am reasonably familiar with configuring Cisco switches, security devices (ASA, PIX etc) and routers, and can find my way around the IOS fairly well, or so I thought. I haven’t really had much to do with Cisco Wireless APs and general AiroNet products as I am still not a great wireless fan apart from where necessary. I have configured lots of 87xW series and 18xxw series with integrated wireless capabilities and the general concept of bridging the Wireless interface to the Vlan or FE interfaces is pretty straight forward.
But the 867w (and 887w) has a full Cisco AP embedded in to the router. The AP has it’s own IOS and needs a full configuration, and even more alarmingly, I could not find any sample wireless configurations anywhere on the net, including on the Cisco.com site. There is a good configuration guide on the Cisco site but it falls way short of the mark to configure the router from scratch. It is much better as a reference guide. I couldn’t find any reference in it to how the 867w’s AP actually integrated, and hence, communicated with the router itself.
Another major issue for me was that the router shipped with an old IOS and apart from that absolutely nothing in the flash. (Pretty sloppy Cisco!)
My problem, in a nutshell, was how to bridge the AP to the router’s vlan. Sounds simple enough doesn’t it. But I couldn’t see an obvious solution and couldn’t find any relevant documentation. I posted on a couple of quality forums to see if anyone else had had a similar issue, and yes lots of people had. What was the solution? None given. Grrr… There are loads of posts pointing to the concept of bridging VLANs and the concept of configuring a router but no wireless sample configs. Personally I find it beneficial when faced with a new device to see a working Config, pull it apart and figure out why it works. I learn the most that way.
So I did the only logical thing I could do, and went to the cupboard and got out an old 877w and ran it up instead. Aaahhhh… the comfort of familiarity. But of course I love technology so I couldn’t let it beat me.
To cut a very long story short, there is a Wlan-GigabitEthernet 0 interface visible in both the Router and the AP configuration and this is the glue that binds the Router to the AP. So, below I have included the running config for each of my relevant interfaces on both the Router and the embedded AP.
Don’t forget that, until you configure a management ip on the AP’s BVI1 the only way to configure the AP is by logging on to the router and the using
Router# service-module wlan-ap 0 session
to get into the AP config. Once in there the only way to get back is to use
AP# <Shift>+<Ctrl>+6 X
to get back to the Router’s Configuration mode. This leaves the AP config session open. If you subsequently want to close that session you also need to type
to close it completely.
On the Router…
interface Vlan1 ip address 192.168.xx.1 255.255.255.0 ip nat inside ip virtual-reassembly end ! interface Wlan-GigabitEthernet0 description Internal switch interface connecting to the embedded AP end ! interface wlan-ap0 description Service module interface to manage the embedded AP ip unnumbered Vlan1 arp timeout 0 end ! interface Dialer0 description PPPoA Dialer for Int ATM0 ip address negotiated ip access-group aclInternetInbound in no ip redirects no ip unreachables no ip proxy-arp ip mtu 1492 ip flow ingress ip nat outside ip virtual-reassembly encapsulation ppp dialer pool 1 ppp authentication chap callin ppp chap hostname ppp chap password ppp ipcp dns request accept ppp ipcp route default ppp ipcp address accept no cdp enable crypto map end
Of course there is no necessity for the
ip route 0.0.0.0 0.0.0.0
due to the ip ipcp route default on the dialer interface.
On the AP
interface Dot11Radio0 no ip address no ip route-cache encryption mode ciphers aes-ccm tkip broadcast-key change 3600 ssid antenna gain 0 speed basic-6.0 basic-9.0 basic-12.0 basic-18.0 basic-24.0 basic-36.0 basic-48.0 basic-54.0 m0. m1. m2. m3. m4. m5. m6. m7. m8. m9. m10. m11. m12. m13. m14. m15. station-role root ap-only bridge-group 1 bridge-group 1 subscriber-loop-control bridge-group 1 block-unknown-source no bridge-group 1 source-learning no bridge-group 1 unicast-flooding bridge-group 1 spanning-disabled end ! interface GigabitEthernet0 description the embedded AP GigabitEthernet 0 is an internal interface connecting AP with the host router no ip address no ip route-cache bridge-group 1 no bridge-group 1 source-learning bridge-group 1 spanning-disabled end ! interface BVI1 ip address 192.168.xx.2 255.255.255.0 no ip route-cache end
And on the AP you will need a default route, so you will need a
AP(config)# ip default-gateway 192.168.xx.1
to tell the outside bound traffic how to get out to the world at large through the Router’s VLAN interface.
Edit: A few people have asked for a full AP config to get started with so here is a “Bare Bone” one to get you started…
version 12.4 no service pad service tcp-keepalives-in service tcp-keepalives-out service timestamps debug datetime localtime service timestamps log datetime localtime service password-encryption hostname AP logging buffered 132000 notifications enable secret 0 <PutAGoodPasswordHere> no aaa new-model clock timezone AEST 10 clock save interval 8 dot11 syslog dot11 ssid SSID authentication open authentication key-management wpa version 2 guest-mode wpa-psk ascii 0 <PutAGoodPasswordHere> username me privilege 15 secret 0 <PutAGoodPasswordHere> bridge irb interface Dot11Radio0 no ip address no ip route-cache encryption mode ciphers aes-ccm tkip broadcast-key change 3600 ssid SSID antenna gain 0 speed basic-6.0 basic-9.0 basic-12.0 basic-18.0 basic-24.0 basic-36.0 basic-48.0 basic-54.0 m0. m1. m2. m3. m4. m5. m6. m7. m8. m9. m10. m11. m12. m13. m14. m15. station-role root ap-only bridge-group 1 bridge-group 1 subscriber-loop-control bridge-group 1 block-unknown-source no bridge-group 1 source-learning no bridge-group 1 unicast-flooding bridge-group 1 spanning-disabled interface GigabitEthernet0 description the embedded AP GigabitEthernet 0 is an internal interface connecting AP with the host router no ip address no ip route-cache bridge-group 1 no bridge-group 1 source-learning bridge-group 1 spanning-disabled interface BVI1 ip address 192.168.xx.2 255.255.255.0 no ip route-cache ip default-gateway 192.168.xx.1 no ip http server no ip http secure-server bridge 1 route ip line con 0 no activation-character line vty 0 2 exec-timeout 20 0 login local transport preferred none transport input telnet line vty 3 4 exec-timeout 20 0 login local transport preferred none transport input ssh transport output all sntp server <IPofSntpServer>
I hope that helps.