Cisco DHCP Server Support for MPLS VPNs??

Hi group,
 
Been playing with DHCP and its various configurations today and came up
against some pain when trying to implement the configs in "DHCP Relay Agent
Support for MPLS VPNs".
The issue I'm having is I can configure the Relay Agent to send the VPN
sub-options to the DHCP server, but I can't get the DHCP server to allocate
an IP address from the VPN-specific pool.
See topology below:
 
        Please view in a fixed-width font such as Courier.
 
                                                |
      10.1.1.1/24 | +---+
    +---+ | +------+R3 |
    |R1 +--------+ 10.1.1.2/24 10.1.2.2/24| +---+
    +---+ | vrf: Global +---+ vrf: RED |
                 +-------------+R2 +------------+
 DHCP Server | +---+ | DHCP Clients
 Cisco IOS | |
                              DHCP Relay | +---+
                              Agent +------+R4 |
                              Cisco IOS | +---+

 
 
R1 config:
 
ip dhcp pool NET-2-RED
   vrf RED
   network 10.1.2.0 255.255.255.0
   default-router 10.1.2.2
   dns-server 192.168.100.100
   domain-name relay.com
 
 
ip vrf RED
 rd 1:1
 route-target export 1:1
 route-target import 1:1
!
 
 
R2 config:
 
ip dhcp relay information option
 
ip vrf RED
 rd 1:1
 vpn id 1:1
 route-target export 1:1
 route-target import 1:1
 
interface FastEthernet0/1
 ip dhcp relay information option vpn-id
 ip vrf forwarding RED
 ip address 10.1.2.2 255.255.255.0
 ip helper-address vrf global 10.1.1.1
 
 
 
Now, when R3 or R4 attempts to get an address via DHCP, R2 sends the request
to R1 with VPN sub-options:
 
(R2 debug output)
R2#sh debugging
DHCP server event debugging is on.
DHCPC:
  DHCP client activity debugging is on (detailed)
 
*Mar 1 00:56:23.423: DHCPD: htype 1 chaddr c402.0a04.0001
*Mar 1 00:56:23.427: DHCPD: remote id 020a00000a01020201000000
*Mar 1 00:56:23.427: DHCPD: circuit id 00000000
*Mar 1 00:56:23.431: DHCPD: table id 1 = vrf RED
*Mar 1 00:56:23.431: DHCPD: VPN id =1:1
*Mar 1 00:56:23.435: DHCPD: Selected subnet=10.1.2.0
*Mar 1 00:56:23.435: DHCPD: Server-id-override=10.1.2.2
*Mar 1 00:56:23.439: DHCPD: giaddr changed to 10.1.1.2
*Mar 1 00:56:56.663: DHCPD: Sending notification of DISCOVER:
*Mar 1 00:56:56.663: DHCPD: htype 1 chaddr c402.0a04.0001
*Mar 1 00:56:56.667: DHCPD: remote id 020a00000a01020201000000
*Mar 1 00:56:56.667: DHCPD: circuit id 00000000
*Mar 1 00:56:56.671: DHCPD: table id 1 = vrf RED
*Mar 1 00:56:56.671: DHCPD: Seeing if there is an internally specified pool
class:
 
But R1 complains that it doesn't have an address pool for R2's address on
the 10.1.1.0/24 subnet (i.e. the subnet between R1 & R2)
 
(R1 debug output)
R1#sh debugging
DHCP server event debugging is on.
DHCPC:
  DHCP client activity debugging is on (detailed)
 
*Mar 1 00:58:26.823: DHCPD: Sending notification of DISCOVER:
*Mar 1 00:58:26.823: DHCPD: htype 1 chaddr c402.0a04.0001
*Mar 1 00:58:26.827: DHCPD: remote id 020a00000a01010100000000
*Mar 1 00:58:26.827: DHCPD: circuit id 00000000
*Mar 1 00:58:26.831: DHCPD: Seeing if there is an internally specified pool
class:
*Mar 1 00:58:26.831: DHCPD: htype 1 chaddr c402.0a04.0001
*Mar 1 00:58:26.835: DHCPD: remote id 020a00000a01010100000000
*Mar 1 00:58:26.835: DHCPD: circuit id 00000000
*Mar 1 00:58:26.839: DHCPD: there is no address pool for 10.1.1.2.
 
 
This is driving me quite batty at the moment! The only thing I can think of
is that IOS can't act as the DHCP server when using the VPN sub-options.
Does anyone have any suggestions/experience with this feature??
 
Cheers,
Gavin

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Received on Sun Jan 31 2010 - 19:01:22 ART