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6200F not passing DHCP to a VLAN

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  • 1.  6200F not passing DHCP to a VLAN

    Posted Apr 25, 2024 05:16 AM

    Hello,

    I'm currently in the process of deploying some new AP505s that include a Guest WiFi implementation that breaks out on a separate VLAN. We tested this with a 2930F to start with as the 6200F was not available and it worked fine with the below config:

    ; JL258A Configuration Editor; Created on release #WC.16.10.0009
    ; Ver #14:67.6f.f8.1d.9b.3f.bf.bb.ef.7c.59.fc.6b.fb.9f.fc.ff.ff.37.ef:44
    hostname "ARUBA-CENTRAL-POC-SW"
    module 1 type jl258a
    ip default-gateway 10.33.0.254
    snmp-server community REDACTED
    snmp-server contact REDACTED
    vlan 1
       name "DEFAULT_VLAN"
       no untagged 7-8
       untagged 1-6,9-10
       ip address 10.34.0.110 255.255.0.0
       ipv6 enable
       ipv6 address dhcp full
       exit
    vlan 20
       name "DATA"
       untagged 7
       tagged 1-6
       ip address 10.33.50.110 255.255.0.0
       ipv6 enable
       ipv6 address autoconfig
       exit
    vlan 30
       name "BREAKOUT"
       untagged 8
       tagged 1-6
       ip address 192.168.31.250 255.255.255.0
       ipv6 enable
       ipv6 address autoconfig
       exit
    management-vlan 20
    spanning-tree
    password manager

    When trying to convert this config for use on the 6200F DHCP does not pass over VLAN20 but does on VLAN30 with the below config:

    Current configuration:
    !
    !Version ArubaOS-CX ML.10.13.1010
    !export-password: default
    hostname REDACTED
    user admin group administrators password ciphertext REDACTED
    ntp server 10.1.2.40 iburst
    ntp server pool.ntp.org minpoll 4 maxpoll 4 iburst
    ntp enable
    !
    !
    !
    !
    !
    !
    ssh server vrf default
    ssh server vrf mgmt
    vsf member 1
        type r8q72a
    vlan 1
    vlan 20
        description DATA
    vlan 30
        description BREAKOUT
    spanning-tree
    interface mgmt
        no shutdown
        ip dhcp
    interface 1/1/1
        no shutdown
        no routing
        vlan trunk native 20
        vlan trunk allowed 20,30
    interface 1/1/2
        no shutdown
        no routing
        vlan trunk native 20
        vlan trunk allowed 20,30
    interface 1/1/3
        no shutdown
        no routing
        vlan trunk native 20
        vlan trunk allowed 20,30
    interface 1/1/4
        no shutdown
        no routing
        vlan trunk native 20
        vlan trunk allowed 20,30
    interface 1/1/5
        no shutdown
        no routing
        vlan trunk native 20
        vlan trunk allowed 20,30
    interface 1/1/6
        no shutdown
        no routing
        vlan trunk native 20
        vlan trunk allowed 20,30
    interface 1/1/7
        no shutdown
        no routing
        vlan trunk native 20
        vlan trunk allowed 20,30
    interface 1/1/8
        no shutdown
        no routing
        vlan trunk native 20
        vlan trunk allowed 20,30
    interface 1/1/9
        no shutdown
        no routing
        vlan trunk native 20
        vlan trunk allowed 20,30
    interface 1/1/10
        no shutdown
        no routing
        vlan trunk native 20
        vlan trunk allowed 20,30
    interface 1/1/11
        no shutdown
        no routing
        vlan trunk native 20
        vlan trunk allowed 20,30
    interface 1/1/12
        no shutdown
        no routing
        vlan trunk native 20
        vlan trunk allowed 20,30
    interface 1/1/13
        no shutdown
        no routing
        vlan access 20
    interface 1/1/14
        no shutdown
        no routing
        vlan access 30
    interface 1/1/15
        no shutdown
        no routing
        vlan access 1
    interface 1/1/16
        no shutdown
        no routing
        vlan access 1
    interface vlan 1
        no ip dhcp
    interface vlan 20
        ip address 10.33.0.150/16
    interface vlan 30
        ip address 192.168.31.250/24
    snmp-server system-description Wi-Fi Switch
    snmp-server system-location REDACTED
    snmp-server system-contact REDACTED
    snmp-server community REDACTED
    ip route 0.0.0.0/0 10.33.0.254
    ip route 0.0.0.0/16 10.33.0.254
    ip route 0.0.0.0/24 192.168.31.254
    !
    !
    !
    !
    !
    https-server vrf default
    https-server vrf mgmt

    I tried adding a DHCP helper to VLAN20 but this didn't work either, am I missing something ?

    Access points are connected to ports 1-12 and need to take traffic from VLAN20 and VLAN30.

    VLAN20 Connected to Corporate LAN and VLAN30 goes straight out to the internet via the router which supplies DHCP to both VLANs.



  • 2.  RE: 6200F not passing DHCP to a VLAN

    Posted Apr 26, 2024 03:18 AM

    What does the actual routing on your network?

    Because if it is the external router then you do not need any routing/IP on this switch

    You just need to have the uplinks tagged correctly



    ------------------------------
    spgsitsupport
    ------------------------------

    Original Message


  • 3.  RE: 6200F not passing DHCP to a VLAN

    Posted Apr 26, 2024 04:18 AM

    There's are a Meraki MX handling the routing/DHCP side of things. VLAN20 is uplinked to access port 13 and VLAN30 on access port 14..

    I get no DHCP being passed to the APs on ports 1&2


    Original Message


  • 4.  RE: 6200F not passing DHCP to a VLAN

    Posted Apr 26, 2024 03:32 AM

    Hi, 
    your config for port 1-6 (AP uplink) differes between 2930f and 6200F.
    2930f: untagged vlan1 + tagged vlan 20,30
    6200f: untagged vlan 20 + tagged vlan 30
    -> so I guess changing the 6200f config to be the same as on 2930f might help.


    Original Message


  • 5.  RE: 6200F not passing DHCP to a VLAN

    Posted Apr 26, 2024 04:22 AM

    OK from the Aruba guide I read on translating the VLAN config from AOS to AOSCX this should work :

        vlan trunk native 20
        vlan trunk allowed 20,30

    What should it be so that tagged traffic from VLAN 20 and 30 gets to the APs on 1-12?

    The uplink on port 12 is configured correctly isnt it ?


    Original Message


  • 6.  RE: 6200F not passing DHCP to a VLAN

    Posted Apr 26, 2024 05:16 AM

    The corresponding setup on CX:

        vlan trunk native 1
        vlan trunk allowed 1,20,30


    Original Message


  • 7.  RE: 6200F not passing DHCP to a VLAN

    Posted Apr 29, 2024 09:44 AM

    in Aruba CX, the "native" VLAN is your "untagged" VLAN that you are used to, from the ProCurve/ArubaOS operating system you are used to on your 2900's. Since you made it native, it's not including the 802.1q VLAN tag in the ethernet header. 

    The post right above this is correct, you need to make vlan 1 the "native". In the CX world, that "allowed" command is what ends up tagging the frames with the VLAN tag.


    Original Message


  • 8.  RE: 6200F not passing DHCP to a VLAN

    Posted Apr 30, 2024 05:57 AM

    Hi, all thanks for your suggestions RE the VLAN config, VLAN1 isn't necessary as its just the default VLAN but I did test adding this to the VLAN config and it didnt change anything RE the DHCP on the corporate WiFi.

    Turns out I just had to set the VLAN to native on the SSID config rather than static which resolved the issue.


    Original Message