cisco 归档 - 第19页共21页

Cisco ASR9000/XR: Understanding Fabric and Troubleshooting

Understand Cisco ASR 9000 fabric architecture (NP, FIA, Trident and Typhoon line cards) and debug drops with show pfm, FIA counters and back-pressure

admin 2026-08-26

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Cisco EVPN/VxLAN Multisite: Troubleshooting Commands

Troubleshoot EVPN-VXLAN across sites on Nexus 9000: read MAC/IP routes, check BGP EVPN next hop and route targets, and prove the data path with captur

admin 2026-08-26

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Cisco ASR 9000 Fan Module Failure: Troubleshooting Guide

Troubleshoot Cisco ASR 9000 fan tray failures with the TAC workflow: show platform, admin show environment fan, log alarms, JOJI reseat and RMA for IO

admin 2026-08-26

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思科交换机排障命令手册：关键时刻救命命令

思科交换机排障命令手册扩写版：先讲排障纪律与分层定位法，再逐段解读 show 命令输出的真实含义，最后给出接口反复 up/down、VLAN 内主机互 ping 不通、二层环路与广播风暴的实战排查流程，并结合真实输出讲解如何区分链路错误与拥塞丢包。

admin 2026-08-25

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Ansible Cisco IOS First Playbook: Commands and VLANs

Ansible Cisco IOS-XE first playbook: venv install, ansible.cfg and group_vars, ios_command show runs, ios_vlans changes, idempotency, backups and libs

admin 2026-08-25

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Cisco Nexus 9000 Troubleshooting Cheat Sheet: Tools

Nexus 9000 troubleshooting cheat sheet: Ethanalyzer, SPAN, ELAM, Packet Tracer, ACL capture, OBFL and event-histories - matched to the symptom each so

admin 2026-08-25

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Catalyst 9000 交换机意外重载故障排除

Catalyst 9000交换机意外重载(Unexpected Reload)的完整排查流程：常见原因分类、一条命令查看上次重载原因、收集show tech-support/crashinfo/tracelogs、提交TAC案例确定根因并做好预防。

admin 2026-08-25

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Catalyst 9000 交换机输出丢包故障排除

Catalyst 9000 交换机输出丢包（output drops）排错指南：解析缓冲区共享池与队列阈值机制，解读 Drop-TH0/TH1/TH2、SBufDrop 与 QebDrop 计数器，用 show interfaces 与 queue stats 定位丢包队列，结合 SPAN/Wire

admin 2026-08-25

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Catalyst 9000 网络延迟和丢包故障排除指南

Catalyst 9000 交换机延迟与丢包排障指南：先用ping与traceroute定位故障跳点，再逐层检查物理层错误计数、STP拓扑变更、MAC抖动与二层环路、CAM/ARP老化、SPAN镜像复制开销和ASIC异常丢弃，并覆盖CoPP punt与MTU分片这两类易被误判的原因，最后给出真实案例

admin 2026-08-25

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Cisco VLAN Config and Verification: Repeatable Workflow

Repeatable Cisco VLAN workflow: plan IDs and subnets, build access ports and trunks, choose SVIs or router-on-a-stick, then verify in a fixed order.

admin 2026-08-24

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