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  • 1.  DHCP POOLs

    Posted 25 days ago

    Hi 

    I am working for aruba cx network implementation and i have to create dhcp pools in the core swtch so I have 3 questions

    1st wnats to confirm that conigurations are right 

    dhcp-server vrf name

    pool VLAN30-POOL 

    range 10.30.30.50 10.30.30.150

      lease 12:00:00

      domain-name example.org.in

      default-router ip 10.30.30.1

      dns-server 125.0.0.1 125.0.0.2 

     enable

    2nd do I have to configure any command in interface vlan related to dhcp

    3rd I have confusion regarding ip gateway mac  in the interface vlan can be the same in all interface vlans and if so what is the best practice should be different or same

    Thanks in advance 



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  • 2.  RE: DHCP POOLs
    Best Answer

    Posted 25 days ago

    Hi Te10,

    1) A small syntax mistake on your config, but the rest is ok

    dhcp-server vrf default

    pool VLAN30-POOL
       range 10.30.30.50 10.30.30.150
       lease 12:00:00
       domain-name example.org.in
       default-router 10.30.30.1
       dns-server 125.0.0.1 125.0.0.2
       enable

    2) Yes this is mandatory. Without an SVI, DHCP will not work.
    You should have something like:
    interface vlan 30
       ip address 10.30.30.1/24
       no shutdown

    You sould need an ip helper-address only if dhcp server is external or dhcp server is in another VLAN or VRF

    3) Yes the gateway MAC address can be the same across all VLAN SVIs. 



    ------------------------------
    Shpat | ACEP | ACMP | ACCP | ACDP
    Just an Aruba enthusiast and contributor by cases
    If you find my comment helpful, KUDOS are appreciated.
    ------------------------------

    Original Message


  • 3.  RE: DHCP POOLs

    Posted 25 days ago

    Thank you for your reply it is clear 

    -------------------------------------------

    Original Message


  • 4.  RE: DHCP POOLs

    Posted 23 days ago

    Hi 

    1st actually I have network from core and access switches 

    in core i configured the management interface vlan and also client interface vlan with dhcp configured in the core too 

    in access switch i configured the management interface vlan and only the client vlan with default route to core through management vlan so there reachability to client interface vlan which is in core but still clients are not taking ip

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    Original Message


  • 5.  RE: DHCP POOLs

    Posted 23 days ago

    On the access-switch, in the client vlan, you need to make it as and interface (which will be the default gateway for your clients) and then you need to configure the dhcp-helper.
    Something like
    interface vlan 30
       ip address 10.30.30.1/24
         ip helper-address 10.30.30.10
       no shutdown



    ------------------------------
    Shpat | ACEP | ACMP | ACCP | ACDP
    Just an Aruba enthusiast and contributor by cases
    If you find my comment helpful, KUDOS are appreciated.
    ------------------------------

    Original Message


  • 6.  RE: DHCP POOLs

    Posted 23 days ago
    Edited by Te10 23 days ago

    I didn't get it

    Let me post my config here 

    2 vsx cores configuration 

    Vlan 60 management 

    Vlan 61 data

    Interface vlan 60

    Ip address 192.168.60. 2

    Active gateway 192.168.60. 1

    Interface vlan 61

    Ip address 192.168.61. 2

    Active gateway 192.168.61. 1

    Dhcp-server vrf default 

    Range 192.168.61. 50 192.168.61. 254

    Leases 12:00:00

    Default-router 192.168.61. 1

    Enable 

    Multi chassies lag

    Native vla 1 

    Trunk allowed all

    Same in other vsx pair 

    _________________

    Access switch configuration 

    Vlan 60 management 

    Vlan 61 data 

    Interface vlan 60 

    Ip address 192.168.60. 11

    I could not ping first after default route to 192.168.60.1 i could ping 

    Lag 

    Vlan trunk allowed all

    Native vlan 1


    Original Message


  • 7.  RE: DHCP POOLs

    Posted 22 days ago

    Do you have a default route towards your core? ip route 0.0.0.0/0 192.168.60.1

    Your access switch must have a DHCP helper for the specific SVI, in your case:
    Interface vlan 60
    Ip address 192.168.60. 11
    ip helper-address 192.168.61.1




    ------------------------------
    Shpat | ACEP | ACMP | ACCP | ACDP
    Just an Aruba enthusiast and contributor by cases
    If you find my comment helpful, KUDOS are appreciated.
    ------------------------------

    Original Message


  • 8.  RE: DHCP POOLs

    Posted 22 days ago
    Edited by Te10 22 days ago

    Ok I got you now 

    So you mean i put the ip helper in the management interface vlan in access switch that is connected me to core and put the imterface vlan of the client in core as ip helper which my default router

    But before this actually yesterday it worked for me without this configuration but i faced an issue that access points were able to get an IP address but PCs were not able that means client can reach dhcp server, is this step you provided will resolve the issue i am facing 

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    Original Message


  • 9.  RE: DHCP POOLs

    Posted 21 days ago
    Edited by shpat 21 days ago

    I am not understanding your question. 

    There are a few ways how you can deploy this.

    This is the easiest way to configure it. 
    You can have 2 Core switches, have the DHCP configured on the core switch. Then you can use VLAN 21 for users and add it on the trunk ports towards the Access Switches.
    Then on Access Switch, you don't have to create any SVI, you just create VLAN21 as access/untagged port towards the clients and the DHCP Should be capable on providing the IP Address.





    ------------------------------
    Shpat | ACEP | ACMP | ACCP | ACDP
    Just an Aruba enthusiast and contributor by cases
    If you find my comment helpful, KUDOS are appreciated.
    ------------------------------

    Original Message


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