Huawei switch: MAC table full

By Sai Kiran Pandrala · reviewed by Sai Kiran Pandrala, Editor Last verified: 2026-05-30

What this guide covers

Fix MAC table full on a Huawei switch.

Step-by-step

1. Check current MAC table utilisation.
2. Identify the offending VLAN or port.
3. Enable storm-control on access ports.
4. Enable port-security with a hard MAC limit.
5. Long-term, refresh to a switch with a larger MAC table.

CLI / commands

display interface brief
display interface GigabitEthernet0/0/1
display device

When the issue persists

• Open a Huawei TAC case with the tech-support bundle.
• Provide the timeline + recent changes.

Frequently asked questions

Will this work on my specific VRP (Versatile Routing Platform) version?

The procedure reflects current VRP (Versatile Routing Platform) behaviour. Older releases may need minor syntax adjustments: use the CLI help (? or tab-completion) to verify.

Should I open a Huawei TAC case immediately?

Open one if you suspect hardware failure or the symptom persists after a maintenance-window reload. Make sure your support entitlement is active first.

Where can I find the Huawei official documentation?

https://support.huawei.com/enterprise/en/knowledge-base.html, search the product family + feature name.

Is this procedure safe in production?

Test in a lab or maintenance window first. Capture pre-change state so you can roll back.

Related guides

• All Huawei fix guides → /huawei/
• All vendor guides → /vendors/

Related fixes

Related guides worth a look while you sort this one out:

• Huawei firewall: MAC table full
• Huawei router: MAC table full
• Huawei switch: MAC address flapping between ports
• Best Huawei switch for branch office
• Best Huawei switch for enterprise data centre
• Best Huawei switch for retail store

References

• Huawei support portal: https://support.huawei.com/enterprise/en/index.html
• Huawei knowledge base: https://support.huawei.com/enterprise/en/knowledge-base.html
• Huawei security advisories: https://www.huawei.com/en/psirt/security-advisories
• Open a case: https://support.huawei.com/enterprise/en/case-management.html

Reference material, not professional advice. Validate against your specific VRP (Versatile Routing Platform) version and test in a non-production environment before applying.

What changed recently?

Fault diagnosis on a Huawei device goes faster when you map the symptom to a recent change:

• Did firmware update in the last 7 days?
• Did the network (router, ISP, VPN) change?
• Was the device moved physically?
• Did paired devices (phone, hub, app) update?
• Were any accessories swapped in or out?

The answer narrows the root cause to a manageable subset.

Before you start

A few things to confirm so the Huawei device fix goes cleanly:

• Latest firmware downloaded if you're going to update.
• Warranty + support contract status checked. opening sealed parts may void it.
• Backup of current configuration (where applicable) taken.
• Spare parts on hand if you anticipate replacement.
• Adequate workspace, lighting, and time, rushing causes regressions.

How to confirm it's actually fixed

On a Huawei device, the test is rarely "reboot and see". Use this list:

• Active reproduction: trigger the original failure path on purpose.
• Indirect reproduction: do an activity that would expose the same subsystem.
• Status indicator review: every LED / display / app status should be green.
• 24-hour soak: leave the device under normal load overnight; check the next morning.
• Telemetry check: review the device or app's diagnostic log for new error entries.

When to call Huawei support instead

Escalate if:

• The same symptom returns within 24 hours of a clean fix.
• You see physical damage (burn marks, swollen battery, cracked PCB).
• The device is in warranty and a hardware replacement is the cheaper outcome.
• Repair requires specialised tools you don't own (alignment jigs, calibration software).
• Following the official path keeps the warranty intact, which matters more than the time spent.

More frequently asked questions

Can I roll this back if something breaks?

Yes for software-level changes (firmware rollback, config rollback). Hardware changes are usually one-way. Always back up settings before starting.

Why is this happening on a brand-new unit?

Out-of-box defects do occur. If you've owned the device under 30 days and the symptom persists after a factory reset, escalate to the seller for replacement under DOA terms before opening a manufacturer support case.

Does this affect other devices on my network?

Generally no. The procedure is local to this device. Network-side changes (firmware updates that affect TLS, SMB, or routing) are flagged explicitly in the steps.

Is it safe to apply during business hours?

If the device is in production use, apply during a scheduled maintenance window. Most procedures need 2-15 minutes of downtime. Capture pre-change state so you can roll back if needed.

How often should I run preventive checks?

Quarterly for most consumer devices; monthly for production / commercial devices. Set a calendar reminder so the device stays healthy between issues.

Real-world view: why this Huawei switch fault is common

I've debugged the mac table full pattern on Huawei S5700, S5735, S6730, S7706, and CloudEngine campus access switches dozens of times. The Huawei VRP error message is usually accurate but terse, and the recovery path depends on which feature actually tripped. So before I touch the config, I always pull two things: display logbuffer filtered to the affected interface, and display interface diagnose on the port. The combination of timestamps and counters is what tells me whether the customer's symptom is a cable, a NIC, a duplex, a security policy, or an upstream loop.

For a typical Indian SMB deployment, the affected switch is usually an S5735-L24P4S-A at INR 64,000-78,000 on GeM, or an S5735-S48T4X-A at INR 1.42L-1.68L for the 48-port model. SmartCare at INR 28,000-42,000/year. Most customers without SmartCare ask for help on the day a port goes dark; with SmartCare, they call earlier in the failure timeline and the fix is cheaper.

Topology context: where this fault actually originates

For mac table full, the topology context matters because the same symptom shows up at different layers. An access switch port refusing to come up could be: physical (cable, transceiver), L1 (duplex/auto-negotiation), L2 (security feature triggered), or upstream (the partner port on the aggregation S6730 has an error). I always reproduce on a test port first; if a known-good cable and known-good endpoint also fails, the switch is the culprit. If they work, the customer's endpoint is.

For BFSI access in a BKC or Whitefield campus, the access switches typically run as stacks with the S6730 core at the top of rack. M-LAG between the stack and the core gives sub-second failover. When the symptom appears on a single port, the stack is healthy; when it appears on multiple ports of the same LPU, the LPU itself is the suspect; when it spans multiple LPUs, it's almost always a config issue.

CLI walkthrough on Huawei VRP for this symptom

The display interface ... transceiver verbose output is the single most useful command for any port-level fault. It exposes the SFP/SFP+ vendor, part number, Rx/Tx optical power in dBm, and temperature. An SFP with Rx power below -18 dBm on a 1G LX is at the cliff edge; below -22 dBm and the link will not come up cleanly. display error-down recovery shows which protective features have tripped and the auto-recovery timer. Some recoveries are auto-timed; others need a manual restart on the interface.

For VRP, the syntax to clear an error-down state once you've fixed the root cause is shutdown then undo shutdown on the interface inside system-view. If you want auto-recovery enabled (and you typically do for production access ports), set error-down auto-recovery cause <feature> interval 300 at global config.

Troubleshooting flow that actually finds the root cause

For the mac table full pattern, my standing diagnostic sequence is:

1. Confirm the affected port and the timestamp from display logbuffer.
2. Check transceiver health (if optical) with display interface transceiver verbose.
3. Verify the partner port on the upstream device.
4. Check for security/protective features (port-security, BPDU-guard, storm-control, link-flap) under display error-down recovery.
5. If the port is in error-down, identify the trigger before clearing: clearing without fixing the cause means a second event in 2-5 minutes.
6. Capture display diagnostic-information if the symptom resists explanation; ship to Huawei TAC.

Common error strings I track in logbuffer for this class of fault: IFNET/4/IF_STATE on a clean state change; SECE/4/PORT_SEC_VLT on a port-security violation; BPDU/4/BPDU_GUARD on a BPDU guard trip; STORM/4/STORM_CONTROL on storm-control trips; LOOPBACK/4/LOOPDETECT on loop detection. Each error string maps to a different recovery path.

India context: SLA, AMC, and the local-partner reality

For a Tier-2 city deployment in Indore, Bhubaneswar, Coimbatore, or Visakhapatnam, the customer's local partner is often the first line of triage. Without SmartCare, the partner is the only line. With SmartCare, the partner triages while a Huawei TAC India engineer in Bengaluru or Chennai works in parallel. For BFSI, the SLA expectations are tight: a port-level outage at a branch costs roughly INR 4,000-12,000 per hour in lost transactions for a typical mid-tier bank branch, depending on footfall.

For DPDP and CSCRF compliance, every port-level event with a security trigger (port-security violation, BPDU guard) needs to land in the SIEM. info-center loghost 10.10.0.50 pointing at a local Wazuh box is my standing configuration. SOC analysts then correlate the port-level event with the endpoint identity from the customer's NAC or Microsoft Entra audit log.

GeM tender pricing on replacement SFPs: a Huawei OSX001N01 (1G LX) lists at INR 4,200; the third-party equivalent at INR 1,400. For SmartCare-covered fleets I use OEM; for break-fix only, the third-party is acceptable on access ports if it's a known-good supplier (FS.com, ATCom, Mellanox-branded).

A mac table full ticket I handled in early May 2026

A QSR (Quick-Service Restaurant) chain with 32 outlets across Karnataka and Tamil Nadu uses a standardised stack: one S5735-L24P4S-A per outlet, uplinked via Bharti Airtel 100 Mbps ILL to a central Bengaluru core. One Tuesday at 4:18 PM, a Mysuru outlet reported all POS terminals offline. Their on-site manager rebooted the switch (always the first attempt; rarely the fix). When that didn't help, the ticket reached me. Console session via the partner's TeamViewer to a local laptop in 12 minutes. display interface brief showed three ports in error-down state. display logbuffer | include 0/0/1|0/0/2|0/0/3 revealed BPDU guard trips on all three within a 90-second window, someone had plugged a small unmanaged 5-port switch into a wall jack to add a second printer, and the cascade had triggered the cycle. Recovery: walk the manager through unplugging the rogue switch, restart on the affected interfaces, and an LLDP-based policy push from the core to set bpdu-guard enable permanently. From console-up to terminals-up: 23 minutes. Invoice: INR 4,200 inclusive of GST.

Questions that come up on tickets like this

Should I disable BPDU guard / port-security to make the issue go away?

No. Those features exist to protect the L2 topology and the management plane. Disabling them solves today's symptom and creates tomorrow's outage. Fix the root cause (rogue switch, duplicate MAC, mis-cabled phone) and leave the protection in place.

How do I configure auto-recovery so I don't have to clear manually?

error-down auto-recovery cause bpdu-guard interval 300 at global config. Apply the same for other causes. The 300-second interval gives time for the root cause to clear; shorter intervals can flap.

What if the port comes up but the endpoint still can't reach anything?

Now the fault is L2/L3, not L1. Check VLAN assignment (display vlan), trunk allowed list, and the access-list on the SVI. The classic miss: port comes up in VLAN 1 (default) because no explicit VLAN was assigned, and VLAN 1 is non-routed in the customer's topology.

Do I need to upgrade VRP to fix this?

Usually no. Most port-level fault recovery is mature on VRP V200R019 and above. Upgrade only if Huawei PSIRT lists an advisory affecting your specific symptom. and then schedule the upgrade through a proper maintenance window.

How do I prove this incident was contained for the auditor?

Bundle the logbuffer excerpt, display error-down recovery output, the timestamp of the fix, and the SIEM event ingestion proof. Three artefacts. Save them per ticket; auditors love clean trails.