Cisco 5508 vs 5520 Wireless Controller
The 5508 is an end-of-life AireOS controller; the 5520 is its higher-scale AireOS successor with roughly 3x the APs and clients, 10G uplinks and Wave 2 support. Between these two the 5520 is the upgrade, though Catalyst 9800 is the current platform.
Cisco 5508 Wireless Controller
Long-serving AireOS controller for midsize campuses, scaling to 500 access points over 1G ports.
- Up to 500 access points and 7,000 clients
- Eight 1G ports, ~8 Gbps throughput
- AireOS with N+1 and SSO HA
- End-of-sale and end-of-support; Wave 1 generation
Cisco 5520 Wireless Controller
High-scale AireOS controller for medium to large campuses with 10G uplinks and Wave 2 support.
- Up to 1,500 access points and 20,000 clients
- Two 10G ports, up to 20 Gbps throughput
- Faster 802.1X client onboarding than the 5508
- 802.11ac Wave 2 support with N+1 and SSO HA
Cisco 5508 Wireless Controller vs Cisco 5520 Wireless Controller: spec comparison
| Spec | Cisco 5508 Wireless Controller | Cisco 5520 Wireless Controller |
|---|---|---|
| Max access points | 500 | 1,500 |
| Max clients | 7,000 | 20,000 |
| Throughput | ~8 Gbps | Up to 20 Gbps |
| Uplink ports | 8x 1G | 2x 10G |
| Form factor | 1RU | 1RU |
| Software | AireOS | AireOS |
| Wi-Fi standard support | Up to 802.11ac Wave 1 | Up to 802.11ac Wave 2 |
| High availability | N+1 and SSO | N+1 and SSO |
| Redundant power | Optional | Dual power supplies |
| Lifecycle status | End-of-sale / EoL | End-of-sale (final AireOS gen) |
Choose Cisco 5508 Wireless Controller if
Keep the 5508 only as an installed unit serving an existing midsize campus under 500 APs while you plan a migration; there is no reason to deploy a new one.
Choose Cisco 5520 Wireless Controller if
Choose the 5520 over the 5508 when you need to scale beyond 500 APs, want 10G uplinks, Wave 2 support and higher client density, while recognizing that Catalyst 9800 is the current platform for new builds.
Verdict
The 5520 triples AP and client capacity over the 5508, adds 10G uplinks and Wave 2, making it the clear AireOS upgrade. Both are end-of-sale AireOS, so if you are refreshing for the long term, evaluate a Catalyst 9800-40 or 9800-80 instead.
Frequently asked questions
What is the difference between the Cisco 5508 and 5520 wireless controllers?
The 5520 supports 1,500 APs and 20,000 clients with 10G uplinks and up to 20 Gbps throughput, roughly triple the 5508's 500 APs, 7,000 clients and 8 Gbps over 1G ports.
Is the Cisco 5508 wireless controller end of life?
Yes. The 5508 has passed end-of-sale and end-of-support; the 5520 was its AireOS successor and Catalyst 9800 is the current IOS XE family.
Does the 5520 support Wave 2 access points?
Yes. The 5520 supports 802.11ac Wave 2 APs and higher client density, while the 5508 is limited to earlier AP generations.
Should I upgrade a 5508 to a 5520 or a Catalyst 9800?
If you must stay on AireOS, the 5520 is the natural upgrade. For a longer support runway and Wi-Fi 6/6E, move to a Catalyst 9800-40 or 9800-80.
More Wireless LAN Controller comparisons
Specs are for planning and may change; Uniqcli confirms the current Cisco bill of materials and pricing on your quote. Cisco, Catalyst, Nexus, Meraki, and Firepower are trademarks of Cisco Systems, Inc.; Uniqcli LLC is an independent authorized Cisco partner.