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Cisco ASR 9901 SW_INACTIVE Fix: FPD Firmware Reflash Guide

ASR 9901 line card stuck in SW_INACTIVE? Field fix: dSC bus deadlock diagnosis, breaking cXR limits via install add source, forcing FPD reflash to Rom

admin 2026-09-02

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【网络运维】记一次 ASR 9901 业务线卡 SW_INACTIVE 故障修复与 FPD 固件强刷全过程

Cisco ASR 9901 线卡卡在 SW_INACTIVE 无法启动?本文实录 dSC 总线死锁诊断、install add source 绕过 cXR 加包限制、FPD 强刷 Rommon 3.04 全过程,风扇暴走避坑,冷启动后 24 个端口满血复活。

admin 2026-09-02

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Huawei S5700 Factory Reset Guide: CLI, BootROM and Recovery

Step-by-step Huawei switch factory reset guide: back up the configuration, run the reset, verify the wipe, harden the switch and troubleshoot failures

admin 2026-09-02

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SFP Optical Transceiver Troubleshooting: Engineer's Checklist

SFP transceiver troubleshooting checklist: read DOM data, clean end faces, check coding, compare Tx and Rx power on both ends, then isolate the fault.

admin 2026-09-02

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CWDM vs DWDM: Which Wavelength Technology to Choose?

CWDM vs DWDM explained: channel spacing, water-peak reach, cost, channel plans, power budgeting and the migration path between the two technologies.

admin 2026-09-02

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Ansible Network Examples: Inventory, Facts and cli_command

Ansible network examples: multi-vendor inventory with network_cli, facts collection with config backup, and platform-independent cli_command playbooks

admin 2026-09-02

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Mellanox Switch Getting Started: First-Time Setup and CLI Basics

Mellanox switch first-time setup: console settings, the MLNX-OS wizard, CLI modes, management IP and route, configuration write and interface verifica

admin 2026-09-02

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Multi-Vendor CLI Cheat Sheet: Cisco, Juniper, Huawei and Nokia

Multi-vendor CLI cheat sheet comparing Cisco IOS, Juniper Junos, Huawei VRP and Nokia SR OS: verb mapping, config models, VLANs, OSPF, BGP and ACLs.

admin 2026-09-02

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ethtool Command Explained: Linux NIC Diagnostics Guide

Learn the ethtool command for Linux NIC diagnostics: link speed and duplex, driver info, error counters, ring buffers, offload features and fibre DOM

admin 2026-09-02

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HPE 3PAR Administration: Common CLI Commands by Category

HPE 3PAR administration end to end: provision a volume from CPG to host, map and verify paths, snapshot and restore, grow space, triage alerts, replac

admin 2026-09-02

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