Multiple AP Models in dhcpd.conf file

[Matt Smeltzer]

I have Cisco 1040 model ap's and now Cisco 1600 ap models that I have up add an LWAPP entry to the dhcpd.conf file to allow the AP's to boot to the controller.

Exisiting:

option space LWAPP;

option LWAPP.controller code 241 = array of ip-address;

class "LWAPP" {

match option vendor-class-identifier;

}

subclass "LWAPP" "Cisco AP c1040" {

vendor-option-space LWAPP;

option LWAPP.controller IP.of.controller;

}

With another model added:

option space LWAPP;

option LWAPP.controller code 241 = array of ip-address;

class "LWAPP" {

match option vendor-class-identifier;

}

subclass "LWAPP" "Cisco AP c1040" {

vendor-option-space LWAPP;

option LWAPP.controller IP.of.controller;

}

subclass "LWAPP" "Cisco AP c1600" {

vendor-option-space LWAPP;

option LWAPP.controller IP.of.controller;

}

Just wondering if this is the configuration or do I need to double all the confirutation, with each subclass going with it's own option space / class paragraph.

Thanks in advance.

Matt

[Scott Fella]

If you have one WLC, you don't need option 60 as that is optional.  Only use it if you want certain model AP's to connect to a certain WLC.

Thanks,

Scott

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[Lionel Gavage]

Hello,

We have multiple WLC for different customers but we are using a central DHCP server under ISC DHCPD.

I tried this configuration:

option space LWAPP;
option LWAPP.controller code 241 = array of ip-address;
class "LWAPP" {
  match option vendor-class-identifier;
}

subnet x.x.x.0 netmask 255.255.255.192 {
        authoritative;
        option routers x.x.x.1;
        option subnet-mask 255.255.255.192;
        default-lease-time 600;
        option domain-name "scrl.local";
        option domain-name-servers x.x.x.x, x.x.x.x;
        range dynamic-bootp x.x.x.10 x.x.x.30;
        max-lease-time 7200;

    subclass "LWAPP" "Cisco AP c3700" {
        vendor-option-space LWAPP;
        option LWAPP.controller x.x.x.44;
    }
    subclass "LWAPP" "Cisco AP c2700" {
        vendor-option-space LWAPP;
        option LWAPP.controller x.x.x.44;

  }

}

subnet y.y.y.0 netmask 255.255.255.192 {
        authoritative;
        option routers y.y.y.1;
        option subnet-mask 255.255.255.192;
        default-lease-time 600;
        option domain-name "scrl.local";
        option domain-name-servers x.x.x.x, x.x.x.x;
        range dynamic-bootp y.y.y.10 y.y.y.30;
        max-lease-time 7200;

    subclass "LWAPP" "Cisco AP c3700" {
        vendor-option-space LWAPP;
        option LWAPP.controller y.y.y.50;
    }
    subclass "LWAPP" "Cisco AP c2700" {
        vendor-option-space LWAPP;
        option LWAPP.controller y.y.y.50;

  }

}

The Access point receives well the right IP addres from the pool but the IP address of the controller is "y.y.y.50" instead of "x.x.x.44"... 

Do you have an idea?  If I put "x.x.x.44" in the other pool I get the right IP for the controller... it's strange.

Version of the ISC DHCPD: Internet Systems Consortium DHCP Server 4.3.1

Thks.

Regards,

Lionel

[Matt Smeltzer]

Thanks Scott

Any suggestion what syntax I would use to have all ap's that boot go to one particular controller?

Thanks

Matt

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[Scott Fella]

I don't know the syntax, but you need to only use option 43.

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[Scott Fella · Accepted solution]

Here is the thing.... if you have one WLC, forget using option 43 and use DNS.  Create a record that will resolve cisco-capwap-controller..com to the WLC management ip address.

Thanks,

Scott

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[Matt Smeltzer]

Thanks Scott in some sites we have 155 sites that report back to the master controller and the server entry we do use some sites just use a simple DNs server that is Linux will have to figure out option 43! Lol

Thanks for all your help Scott

M

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[Scott Fella]

Yeah I was stuck on an install where the customers guy who management their Linux dhcp and DNS retired. Well dhcp was a pain and we ended up figuring out how to setup the DNS.

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[Scott Fella · Accepted solution]

Looks like option 43 is already defined on your script.

https://supportforums.cisco.com/message/1272318#1272318

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[Matt Smeltzer]

Bingo I see what I need here with one of the bottom lwapp line, this is exactly what I am looking for! Thanks so much for that!

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[Scott Fella]

No problem.

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