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标签：troubleshooting

iPerf3 Throughput Testing: A Repeatable Methodology

iPerf3 Throughput Testing: A Repeatable Methodology

Run iperf3 properly: server setup, window sizing, parallel streams, omit slow start, reverse mode, UDP tests and the traps that produce wrong numbers.

admin admin 2026-10-02
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BPDU Guard vs Root Guard vs Loop Guard Compared

BPDU Guard vs Root Guard vs Loop Guard Compared

Compare BPDU Guard, Root Guard and Loop Guard: what each protects against, how the port reacts, whether recovery is automatic, and where to deploy the

admin admin 2026-10-02
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Cisco ASR 9000 IOS XR show Commands for Troubleshooting

Cisco ASR 9000 IOS XR show Commands for Troubleshooting

A practical set of Cisco ASR 9000 IOS XR show commands for hardware, fabric, interfaces, routing and processes, with what each output tells you.

admin admin 2026-10-02
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华为交换机恢复出厂设置三种方法对比

华为交换机恢复出厂设置三种方法对比

对比华为交换机恢复出厂设置的三种方法：PNP 按键、reset factory-configuration 与 reset saved-configuration，含每种方法清除范围、适用场景、确认与验证命令，避免误删数据文件或恢复后仍加载旧配置。

admin admin 2026-10-02
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Dell OS10 Factory Reset & Default Gateway Recovery

Dell OS10 Factory Reset & Default Gateway Recovery

Reset a Dell PowerSwitch OS10 back to factory defaults and bring the management default gateway back up, with backup, reset and verification steps.

admin admin 2026-10-02
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MC-LAG ICCP Failures: Liveness & LACP System ID

MC-LAG ICCP Failures: Liveness & LACP System ID

A Juniper MC-LAG playbook for ICCP failures: the liveness and ICL matrix, how the LACP system ID changes, and the show commands that prove it.

admin admin 2026-10-02
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Arista EOS BFD: Timers, Protocol Integration and Tuning

Arista EOS BFD: Timers, Protocol Integration and Tuning

Configure BFD on Arista EOS: interval and multiplier tuning, BGP and static route integration, session scale, and verification commands.

admin admin 2026-10-01
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Dynamic ARP Inspection: Configuration and Failure Scenarios

Dynamic ARP Inspection: Configuration and Failure Scenarios

Configure Dynamic ARP Inspection with DHCP snooping and ARP ACLs, avoid the classic outages, and verify it with the right show commands.

admin admin 2026-10-01
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BGP Route Hijacking: Detection and Mitigation Playbook

BGP Route Hijacking: Detection and Mitigation Playbook

Detect and mitigate BGP route hijacks with RPKI ROV, IRR filters, BMP monitoring and the incident steps that actually restore traffic.

admin admin 2026-10-01
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802.1X Supplicant Troubleshooting: EAPOL Debug Step by Step

802.1X Supplicant Troubleshooting: EAPOL Debug Step by Step

Debug 802.1X supplicant failures with EAPOL packet captures, switch-side dot1x debugs and certificate checks that find the real cause fast.

admin admin 2026-10-01
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