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Different SSID, same VLAN

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  • 1.  Different SSID, same VLAN

    Posted 26 days ago

    Corporate has mandated that we only use SSID to engineering to bypass firewalls. East coast uses SSIDA and Central uses SSIDB. SSIDA will be replacing in the central offices.

    Creating the SSID, AAA, & 802.1x profiles is a easy. Instead of building a new VLAN and then removing the old VLAN can I use the same VLAN for both SSID's for test and cut-over. Then remove the old SSID?

    I looked at a few of similar threads, but didn't really see an answer.


  • 2.  RE: Different SSID, same VLAN

    Posted 25 days ago
    • The short answer is yes, you can assign the same VLAN to different SSIDs.
    • The longer answer is there may be some additional considerations, but you didn't mention anything about the scale of users on both SSIDs, usage of VLAN pools, or if the SSIDs are on the same controller or different.
    • I would double-check that the VLAN you want to share between SSIDs is scoped appropriately to handle the number of clients on both SSIDs.
    • Also consider any planned client growth on both SSIDs between now, testing, and cutover which may cause DHCP scope exhaustion. If the scope cannot accommodate the number of clients (factoring both SSIDs), instead of sharing the VLAN, add a larger VLAN to the target SSID.

  • 3.  RE: Different SSID, same VLAN

    Posted 25 days ago

    We have 2000 users on the campus using 4 SSIDs. SSIDA sees 100-125 devices a day. DHCP scope is 500 /23. VLAN is a /23. Capacity wise we are good.

    This will be a temporary move. We are migrating from SSIDA to SSIDB, very short notice. SSIDA goes away in about 3 weeks.


  • 4.  RE: Different SSID, same VLAN

    Posted 20 days ago

    If this is a migration, so clients are either on SSIDA or on SSIDB, I would not expect too many issues. Same VLAN on different SSIDs works fine, different VLAN on same SSID as well.

    It's recommended to keep the number of SSIDs as low as reasonable possible, which is mostly because of the beaconing overhead. But as it is transitionary, it should not really be an issue.

    Herman Robers
    If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check https://www.arubanetworks.com/support-services/contact-support/ for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.

    In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.