AP1311 Throughput Issue: 1Gbps Wired vs 100Mbps Wireless (OmniVista Managed)

[dolu07]

Hi everyone,

I am experiencing a significant throughput discrepancy between wired and wireless clients in our network environment. I would appreciate any insights or suggestions.

Network Topology:

Core Switch: Alcatel-Lucent OmniSwitch 6900-X72

Edge Switch: OmniSwitch 6560 (connected to APs)

Access Points: OAW-AP1311 (Stellar Wi-Fi 6)

Management: OmniVista 2500 NMS 4.9R2 GA (Build 15

The Problem:

Wired Performance: When I connect a PC via cable to the same Edge Switch (OS6560), I can download an ISO file from our local server at 90-100 MB/s (~800 Mbps).

Wireless Performance: Using a Wi-Fi 6 client (connected at 1.2 Gbps PHY rate, RSSI -49 dBm), the same file download from the same server is capped at 10-12 MB/s (~80-90 Mbps).

What I have checked/configured so far:

Interface Speed: Verified that the AP’s switch port is Negotiated at 1000 Mbps / Full Duplex. No CRC or input errors on the port.

Access Role Profile (ARP): I have checked the bandwidth contracts in OmniVista. The Downstream/Upstream rates for the client’s role are set to 0 (Unlimited).

RF Settings:

Channel Width: Tested both 40MHz (HE40) and 80MHz (HE80).

Airtime Fairness: Enabled.

Band: Client is confirmed to be on the 5GHz band.

Ping Tests: During high-load transfers, I observe occasional "Request timed out" and latency spikes (up to 140ms), but the low throughput remains constant even when the ping is stable at 2ms.

MTU: Verified with ping -f -l 1472. No fragmentation issues found.

Observation: It feels like there is a software-based rate limiter or a CPU bottleneck on the AP side (DPI/Application Visibility?), but I couldn't find any active enforcement rules. The wired speed proves the Core, Edge, and Server are capable of Gigabit speeds.

Has anyone encountered this "100Mbps ceiling" on Stellar APs despite having a Gigabit backhaul and high PHY rates? Any specific settings in OmniVista that I might have overlooked?

Thanks in advance for your help!