Inserting subscriber id in to DHCP Discover when using EFPs on a Cisco 3600x

[jbillo27]

We are trying to insert the subscriber-id option in to the DHCP DISCOVER packet using the configuration under an EFP as per below. In this example the DHCP server does not receive the DHCP subscriber-id option that has been configured.

ip dhcp relay information option
ip dhcp relay information policy encapsulate
ip dhcp relay information trust-all

interface Vlan50
 ip dhcp relay information trusted
 ip address 192.168.130.1 255.255.255.0
 ip helper-address 10.1.1.5

interface GigabitEthernet0/2
 switchport trunk allowed vlan none
 switchport mode trunk
 ip dhcp relay information option-insert
 service instance 101 ethernet
  encapsulation dot1q 18
  rewrite ingress tag pop 1 symmetric
  ip dhcp relay information option subscriber-id EXAMPLE
  bridge-domain 50

If I move the subscriber id configuration under the vlan as per below it works perfectly and the DHCP server receives the subscriber id sub-option within option 82 of the DHCP Discover packet. 

ip dhcp relay information option
ip dhcp relay information policy encapsulate
ip dhcp relay information trust-all

interface Vlan50
 ip dhcp relay information trusted
 ip address 192.168.130.1 255.255.255.0
 ip helper-address 10.1.1.5
 ip dhcp relay information option subscriber-id EXAMPLE

interface GigabitEthernet0/2
 switchport trunk allowed vlan none
 switchport mode trunk
 ip dhcp relay information option-insert
 service instance 101 ethernet
  encapsulation dot1q 18
  rewrite ingress tag pop 1 symmetric
  bridge-domain 50

Can anyone provide any working examples for the use case of configuring "ip dhcp relay information option subscriber-id" within the efp, or point to the relevant documentation?

Firmware version is 15.5(3)S8

[balaji.bandi]

I am thinking this was due that interface in bridge mode "bridge-domain 50"

Do you have BVI Interface ? where you can configure

[jbillo27]

On this series of cisco switch when you add the bridge-domain command under an EFP it will automatically create and link the SVI if it doesn’t exist, so in this case we are not using a BVI.

L2 and L3 forwarding is fully working using the SVI. 

[jbillo27]

Does anyone have any suggestions?

[jbillo27]

Any suggestions? Still can't find any literature on this.

[trowland]

@jbillo27 Did you ever get a solution to this as IM trying todo the same and getting the same results