[c-nsp] ASR9k/IOS-XR BNG for IPoE (DHCP) help

[Simon Lockhart]

All,

I'm currently evaluating the ASR9001 as a BNG for IPoE traffic (Double VLAN
tagged traffic, doing DHCP) - but I'm having difficulties getting the DHCP
proxy bit working. Has anyone done this before, or can anyone help point me
in the direction of why my config isn't working?

I've been working through the example at https://supportforums.cisco.com/docs/DOC-19702 and have come up with the following config:

------ 8< -------- 8< ---------
dhcp ipv4
 profile IP_DEFAULT proxy
  helper-address vrf default 192.168.130.20 giaddr 100.64.248.129
  relay information check
  relay information option
  relay information policy keep
  relay information option allow-untrusted
 !        
 interface Bundle-Ether1.3121 proxy profile IP_DEFAULT
!         
interface Bundle-Ether1.3121
 ipv4 address 100.64.248.129 255.255.255.192
 service-policy type control subscriber IP_PM
 ipsubscriber ipv4 l2-connected
  initiator dhcp
 !
 encapsulation ambiguous dot1q 3121 second-dot1q any
!
interface TenGigE0/0/2/1
 bundle id 1 mode on
!
dynamic-template
 type ipsubscriber IPSUB_TPL
 !
!
class-map type control subscriber match-any DHCP
 match protocol dhcpv4 
 end-class-map
!
policy-map type control subscriber IP_PM
 event session-start match-first
  class type control subscriber DHCP do-until-failure
   5 activate dynamic-template IPSUB_TPL
  !
 !
 end-policy-map
!
end

------ 8< -------- 8< ---------

Now, if I do "debug dhcp ipv4", I can see my DHCP requests coming in, and it
starts to process them, but the requests are never forwarded to my DHCP server.

If I do "show dhcp ipv4 proxy binding detail", it sees the client ok, but 
doesn't show the server address:

------ 8< -------- 8< ---------
RP/0/RSP0/CPU0:test-asr9k.lab.cc#show dhcp ipv4 proxy binding detail
Thu Jun  6 22:08:00.070 UTC
MAC Address:                 100d.7f4d.1cda
VRF:                         default
Server VRF:                  -
IP Address:                  0.0.0.0
Giaddr from client:          0.0.0.0
Giaddr to server:            0.0.0.0
Server IP Address:           0.0.0.0
Server IP Address to client: 0.0.0.0
ReceivedCircuit ID:          Xxx-21 eth 3/1/2/1/1:102
InsertedCircuit ID:          Xxx-21 eth 3/1/2/1/1:102
ReceivedRemote ID:           SimonsHouse
InsertedRemote ID:           SimonsHouse
ReceivedVSISO:               -
InsertedVSISO:               -
Auth. on received relay info:FALSE
Profile:                     IP_DEFAULT
State:                       INIT
Proxy lease:                 60 secs (00:01:00)
Proxy lease remaining:       22 secs (00:00:22)
Client ID:                   0x01-0x10-0x0D-0x7F-0x4D-0x1C-0xDA
Access Interface:            Bundle-Ether1.3121
Access VRF:                  default
VLAN Id:                     outer 3121, inner 102
Subscriber Label:            0x0
*

* Next renew request from this client will be NAK'd in order to recreate subscriber session

------ 8< -------- 8< ---------


Any ideas why it might not be forwarding on the DHCP requests?

Many thanks in advance,

Simon