06-14-2022
10:26 AM
- last edited on
06-22-2022
09:49 AM
by
Translator
Hello,
I have several branch connected in MPLS.
Branch A ( main branch, with 2 DHCP servers)
Branch B ( without DHCP server).
I would like to use DHCP servers on branch A to distribute IP adresses on branch B.
I asked to my operator to set up dhcp relay because I can't make modification myself on the ISP router.
But i was still able to obtain the configuration files of the 2 ISP routers ( A and B), and i see that they put the DHCP relays on interface 0/0 on router A ( main branch).
interface GigabitEthernet 0/0
ip address x.x.x.x 255.255.255.0
no negotiation
duplex full
speed 1000
ip helper-address 10.39.1.223 ==>My first DHCP server
ip helper-address 10.39.1.224 ==>Second DHCP server
description *** LAN CLIENT ***
Does the configuration have to be applied on the main router ( A) or on the remote branch router (B) or the two?
Solved! Go to Solution.
06-23-2022 05:20 AM
Ok thank you MHM Cisco Monde
the wiring at this site is being completely replaced ( parallel to production) so as soon as the work has progressed, i can go and test by plugging my L3 switch, instead of the current one, to test the connectivity with the central site and the DHCP.
06-23-2022 06:08 AM
I have done this in MPLS sites with DHCP servers on different sites. If the difference is that it is a Layer 3 switch instead of a router, the logic does not change at all. You add the ip-helper at the VLAN interface in the L3SW. You create an interface VLAN with the subnet of site B and you put the ip-helper there. You can specify the default router in the access switch
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