Lsw-3 Firmware -

LSW-3# boot system flash:/lsw3_fw_v7.0.4.bin WARNING: This will replace the active firmware image. Continue? (y/N): y

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| Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | Switch boot loops after upgrade | Environment variable corruption | Interrupt boot (Ctrl+C in U-Boot), run setenv bootargs console=ttyS0,115200 , then boot . | | Ports 45-48 show "Link up, no traffic" | Microcode failed to load on those ports due to PHY initialization order | clear interfaces counters + power cycle port 45 + no shutdown . If persists, downgrade to 6.8.3 then re-upgrade to 7.0.4. | | Web GUI loads slowly (>15 sec) | SSL certificate generation on first boot (new in v7.x) | Wait 5 minutes. Or disable HTTPS via no ip http secure-server and use HTTP only in secure lab environments. | | SNMP walk returns null for OID 1.3.6.1.2.1.31.1.1.1.6 (ifHCInOctets) | 64-bit counter overflow handling bug | Upgrade to 7.0.4 (fixed). Interim workaround: use 32-bit counters (ifInOctets) which wrap every 4GB. | Given the prevalence of IoT botnets scanning for vulnerable switches, the LSW-3 firmware now includes a "hardening mode." Activate it via: lsw-3 firmware

LSW-3(config)# security hardening level high This will: - Disable Telnet and HTTP (only SSH and HTTPS) - Enable port security (max 2 MAC addresses per port) - Disable ICMP redirects - Set session timeout to 300 seconds - Enable storm-control broadcast level 1% Confirm? (y/N): y After hardening, remember to create a new local user. The default admin account is disabled by hardening mode: LSW-3# boot system flash:/lsw3_fw_v7