Jeff,
The fact is that the IOS DHCP server does not support VCI functionality.
If you're interested in this feature, you can track CSCsq30317, which I
filed 4 years ago (but no activity on it yet.)
Aaron
----
Related-file:: Added 2008-05-15 by aaron ::Release-note
<B>Symptom:</B>
Some DHCP servers can transmit different option 43 (Vendor Specific
Information) values, depending on the option 60 (Vendor Class Identifier)
values received from the clients. See RFC-2132, sec. 9.13.
The IOS DHCP server cannot. As a result, a given IOS DHCP server
scope must return the same option 43 value to all clients that it
serves from that scope, regardless of those clients' VCIs.
<B>Conditions:</B>
Multiple client types in the same subnet, which desire different
option 43 values.
<B>Workarounds:</B>
1. In the general DHCP pool for the subnet, configure the desired
option 43 value for the most prevalent client type. For each other
client, give it its own separate scope (using the specific client-id
for each client), with its preferred option 43 value.
2. Put the separate client types into separate VLANs/subnets, each
with a separate DHCP pool with its unique option 43 value.
3. With IOS 12.4(11)T or above, DHCP requests with different
option 60 values can be relayed to different DHCP servers. See
"Configuring DHCP Relay Class Support for Client Identification"
in the IOS documentation.
<B>Further Problem Description:</B>
Some DHCP client implementations may misbehave when receiving DHCP
option 43 values that they cannot understand. Customers encountering
such problematic implementations should contact technical support for
that software to learn about the availability of a fix. See, for example,
http://support.microsoft.com/kb/953761 .
----
On 5/6/2012 9:00 AM, [email protected]
([email protected]) wrote:
Send CCIE_Wireless mailing list submissions to
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When replying, please edit your Subject line so it is more specific
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Today's Topics:
1. DHCP option 60 on IOS help (Jeff Rensink)
2. Re: DHCP option 60 on IOS help (Blake Krone)
3. Re: DHCP option 60 on IOS help (Nawar Al Nomani)
----------------------------------------------------------------------
Message: 1
Date: Sat, 5 May 2012 21:24:25 -0500
From: Jeff Rensink<[email protected]>
To: [email protected]
Subject: [OSL | CCIE_Wireless] DHCP option 60 on IOS help
Message-ID:
<cag4_piugjqfo1zbr61ib0o0pzjq66xzximrfi8_xh6czuun...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
I'm running drills on controller discovery and I'm hitting an issue that I
can't deem to solve. I'm trying to use my 3560E as the DHCP server. It
works fine just doing option 43. But when I try and throw in option 60 to
target a specific AP model, it still advertises the controller IP to all
models. I have verified this with a packet capture showing the DHCP option
43 info in the DHCP ACK packet from the switch.
My setup is a 3560E layer 3 switch with a 1131, 1142, 1242, and 2- 1252
APs. The DHCP config is shown below. I did try 2 different revs of code
in case it was a bug (12.2.44 SE# and 12.2.58 SE#). When all 5 APs boot,
they all get the option 43 info. Can anyone see if I'm doing something
wrong? Has anyone else made this work as advertised in IOS?
ip dhcp excluded-address 10.10.114.1 10.10.114.99
ip dhcp excluded-address 10.10.114.160 10.10.114.255
ip dhcp pool vlan114
network 10.10.114.0 255.255.255.0
default-router 10.10.114.1
option 43 hex f104.0a0a.700a
dns-server 10.10.210.6
domain-name rensink.local
option 60 ascii Cisco AP c1250
Jeff Rensink
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Message: 2
Date: Sat, 5 May 2012 23:31:10 -0500
From: Blake Krone<[email protected]>
To: Jeff Rensink<[email protected]>
Cc: [email protected]
Subject: Re: [OSL | CCIE_Wireless] DHCP option 60 on IOS help
Message-ID:
<CAE8-+duCPL=t30rsirwwuv7oaprwh23voz7kkja0bkpsp+u...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Jeff have you tried with quotes? option 60 ascii "Cisco AP c1250"
On Sat, May 5, 2012 at 9:24 PM, Jeff Rensink<[email protected]> wrote:
I'm running drills on controller discovery and I'm hitting an issue that I
can't deem to solve. I'm trying to use my 3560E as the DHCP server. It
works fine just doing option 43. But when I try and throw in option 60 to
target a specific AP model, it still advertises the controller IP to all
models. I have verified this with a packet capture showing the DHCP option
43 info in the DHCP ACK packet from the switch.
My setup is a 3560E layer 3 switch with a 1131, 1142, 1242, and 2- 1252
APs. The DHCP config is shown below. I did try 2 different revs of code
in case it was a bug (12.2.44 SE# and 12.2.58 SE#). When all 5 APs boot,
they all get the option 43 info. Can anyone see if I'm doing something
wrong? Has anyone else made this work as advertised in IOS?
ip dhcp excluded-address 10.10.114.1 10.10.114.99
ip dhcp excluded-address 10.10.114.160 10.10.114.255
ip dhcp pool vlan114
network 10.10.114.0 255.255.255.0
default-router 10.10.114.1
option 43 hex f104.0a0a.700a
dns-server 10.10.210.6
domain-name rensink.local
option 60 ascii Cisco AP c1250
Jeff Rensink
_______________________________________________
For more information regarding industry leading CCIE Lab training, please
visit www.ipexpert.com
Are you a CCNP or CCIE and looking for a job? Check out
www.PlatinumPlacement.com
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Message: 3
Date: Sun, 6 May 2012 09:54:58 +0400
From: Nawar Al Nomani<[email protected]>
To: Jeff Rensink<[email protected]>
Cc: [email protected]
Subject: Re: [OSL | CCIE_Wireless] DHCP option 60 on IOS help
Message-ID:
<cacxrxw0zt-pc-hsrsuvroeb-mpgnnd5_azo2klh41rzhvhb...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi Jeff,
you may try the following syntax format& commands order& hopefully it
will work for you.
though not sure if this is the issue, but in all my deployments I use the
following format& it always works fine.
ip dhcp pool vlan114
network 10.10.114.0 255.255.255.0
option 60 ascii "Cisco AP c1250"
option 43 hex f104.0a0a.700a
default-router 10.10.114.1
dns-server 10.10.210.6
domain-name rensink.local
Regards,
Nawar Al Nomani
On Sun, May 6, 2012 at 6:24 AM, Jeff Rensink<[email protected]> wrote:
I'm running drills on controller discovery and I'm hitting an issue that I
can't deem to solve. I'm trying to use my 3560E as the DHCP server. It
works fine just doing option 43. But when I try and throw in option 60 to
target a specific AP model, it still advertises the controller IP to all
models. I have verified this with a packet capture showing the DHCP option
43 info in the DHCP ACK packet from the switch.
My setup is a 3560E layer 3 switch with a 1131, 1142, 1242, and 2- 1252
APs. The DHCP config is shown below. I did try 2 different revs of code
in case it was a bug (12.2.44 SE# and 12.2.58 SE#). When all 5 APs boot,
they all get the option 43 info. Can anyone see if I'm doing something
wrong? Has anyone else made this work as advertised in IOS?
ip dhcp excluded-address 10.10.114.1 10.10.114.99
ip dhcp excluded-address 10.10.114.160 10.10.114.255
ip dhcp pool vlan114
network 10.10.114.0 255.255.255.0
default-router 10.10.114.1
option 43 hex f104.0a0a.700a
dns-server 10.10.210.6
domain-name rensink.local
option 60 ascii Cisco AP c1250
Jeff Rensink
_______________________________________________
For more information regarding industry leading CCIE Lab training, please
visit www.ipexpert.com
Are you a CCNP or CCIE and looking for a job? Check out
www.PlatinumPlacement.com
-------------- next part --------------
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------------------------------
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Are you a CCNP or CCIE and looking for a job? Check out
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