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Newbie question:

In our law office we have the following setup: Juniper SRX connected to Cisco L3 switch via trunk port.

Cisco switch has:

VLAN 5 range: 10.4.0.10 - 250 /24
VLAN 6 range: 10.5.0.10 - 250 /24

I want to setup DHCP pool on the Juniper side while keeping those VLANs in mind:

set system services dhcp pool 10.4.0.0/24 address-range low 10.4.0.10
set system services dhcp pool 10.4.0.0/24 address-range high 10.4.0.250
set system services dhcp pool 10.5.0.0/24 address-range low 10.5.0.10
set system services dhcp pool 10.5.0.0/24 address-range high 10.5.0.250

What would be the IP address of the router assigned to clients for the DHCP pool?

set system services dhcp pool 10.4.0.0/24 router ???
set system services dhcp pool 10.5.0.0/24 router ???

Am I even on the right track?
Any other suggestions or something to keep in mind?

Thank you in advance.

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Yes, you're on the right page. You need to start by creating the vlans and setting the interfaces on the SRX. The router will be the IP of the Juniper on that vlan.

Create Vlans

set vlans marketing vlan-id 5 set vlans finance vlan-id 6 commit

Decide which interfaces to use

[edit interfaces ge-0/0/3] set unit 0 family ethernet-switching vlan members marketing finance (you might need to separate marketing and finance into two commands or use a comma between. Not sure....) commit

Create layer3 interface for each vlan

set interface vlan unit 5 family inet address 10.4.0.1/24 (assuming .1 is what you want the SRX to be) set interface vlan unit 6 family inet address 10.5.0.1/24

Finish dhcp pool config

set system serivces dhcp pool 10.4.0.0/24 router 10.4.0.1 (assuming this is what you picked above to be the SRX) set vlan marketing l3-interface vlan.5 set system serivces dhcp pool 10.5.0.0/24 router 10.5.0.1 (assuming this is what you picked above to be the SRX) set vlan marketing l3-interface vlan.6

more info: http://www.mustbegeek.com/configure-dhcp-server-for-multiple-vlans-in-junos/

  • Thank you, Paul! Another thing I forgot to mention: I have VLAN 7 setup for trunking on Cisco and the same matching VLAN 7 on Juniper assigned to its trunk port. Anything else I need to consider? From what I understand, I just need to create matching VLANs 5 and 6 on the Juniper's trunk, correct? – Mark Sep 4 '14 at 20:13
  • If you mean that the trunk between the switch and the SRX is passing vlan7, yes you need to add vlans 5 and 6 to the trunk on both sides. – Paul Ackerman Sep 4 '14 at 23:58
  • @Mark, Were you able to get it going? – Paul Ackerman Sep 9 '14 at 1:05
  • Sorry, was away for a while (out-of town meeting). So far all looks good and I am accepting your answer, Paul. So when I >> set interface vlan unit 5 family inet address 10.4.0.1/24 << I am assigning this IP address to serve as a gateway for my vlan5, correct? Thanks again. – Mark Sep 10 '14 at 21:47

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