Hello All,
I have a scenario wherein, there are 2 cores are connected together via a layer 2 trunk. Has two VLAN between the two cores I.e. core to core subnet a /28 and a /24 VLAN which is the infra VLAN.
Infra VLAN:
VLAN 100
ip address 10.12.1.254/24
Both cores have an out of band VLAN 1000 with different IPs. They do not have an dhcp helper configured.
I.e.
Core A
VLAN 1000
Ip address 192.168.1.254/24
Core B
VLAN 1000
Ip address 172.26.1.254/24
Core A is the spanning tree root.
This is how the topology is designed:
Core-A----vlan10, vlan 100 trunk-----Core-B
| |
A-R1-OOB B-R11-OOB
| |
Host-A Host-B # They are both in VLAN 1000 right now; with their respective IPs.
Goal: My goal is for me to not change the VLAN IDs. and assign the hosts in "a single" different VLAN say VLAN 2000 and IP address being 10.10.0.0/23 network. I.e. both the hosts A and B should get a "DHCP" address from VLAN 2000.
From my reading, you can achieve this via secondary address and using a dhcp-helper for that pool.
Thus,
On core A
VLAN 1000
ip address 192.168.1.0/24
ip address 10.10.0.0/23 secondary
ip dhcp-helper 10.12.1.250 #DHCP server that will have a pool in 10.10.0/23 network
Will this solve my problem? Do I need to configure this on Core B as well AND add VLAN 1000 on the trunk link??
Since I believe both cores do not see each others out of band hosts coming from VLAN 1000.
If I need to add this on Core B as well will it cause any issues? What will the config look like?
Or do I need to implement VRF for this?
