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C9300/9500 - DHCP over MPLS/VPLS

tomasgravvold
Level 1
Level 1

Hi there,

 

(Switches in question here are C9500-48Y4C (swA) and C9300-24T (swB), both running at version 17.3.3.)

 

I'm trying to get DHCP to work over MPLS/VPLS (which is working very well besides DHCP).

I suspect some sort of ip helper is required to get this to work, but I can't understund why.. 

 

Excerpt from Switch A:

 

interface Vlan1080
 ip address 10.0.0.1 255.255.255.0
 ip helper-address 8.7.6.5
 xconnect vfi vpls_vlan1080
!
l2 vfi vpls_vlan1080 manual
 vpn id 1080
 neighbor 47.47.47.47 encapsulation mpls
!

 

 

Switch B:

 

interface Vlan1080
 no ip address
 xconnect vfi vpls_vlan1080
!
l2 vfi vpls_vlan1080 manual
 vpn id 1080
 neighbor 7.7.7.7 encapsulation mpls
!

(IP addresses are obscurifed, of course..)

 

 

I have read this article, which is more or less the same as I'm trying to accomplish, but where the article puts a helper-address on the customer facing interface, this is not possible on my switches.

https://sites.google.com/site/amitsciscozone/mpls/mpls-wiki/dhcp-relay-support-for-mpls-vpn

 

All help is greatly appreciated

 

regards

Tomas

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