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.
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Herman Robers
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Original Message:
Sent: Jun 28, 2024 09:59 AM
From: scott.smith
Subject: Different SSID, same VLAN
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.
Thanks.
Original Message:
Sent: Jun 27, 2024 10:59 PM
From: schmelzle
Subject: Different SSID, same VLAN
- 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.
Original Message:
Sent: Jun 27, 2024 06:30 PM
From: Scott Smith
Subject: Different SSID, same VLAN
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.