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Cisco IOS XE Install Mode: Upgrade and Rollback Guide

Cisco IOS XE Install Mode: Upgrade and Rollback Guide

Cisco IOS XE install mode explained: install add/activate/commit, ISSU vs cold reload, package.conf and how to roll back an upgrade that went wrong.

admin admin 2026-10-10
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Catalyst 9300: StackWise-480 vs StackWise-1T vs VSS

Catalyst 9300: StackWise-480 vs StackWise-1T vs VSS

Compare Cisco Catalyst 9300 stacking options: StackWise-320/480/1T bandwidth, ring throughput, mixing rules and how it differs from VSS designs.

admin admin 2026-10-03
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Spanning Tree Root Bridge Election and Design Rules

Spanning Tree Root Bridge Election and Design Rules

Bridge ID, path cost and the extended system ID decide your STP root. Configure root primary and secondary, add MST and guard features, then verify it

admin admin 2026-09-14
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Catalyst 9300: StackWise-480 vs StackWise Virtual

Catalyst 9300: StackWise-480 vs StackWise Virtual

How StackWise-480 and StackWise Virtual differ under the hood: shared backplane versus fibre virtual link, bandwidth, failure domain and which to depl

admin admin 2026-09-13
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Cisco 交换机 CPU 占用过高排查：从 show processes 到 CoPP

Cisco 交换机 CPU 占用过高排查：从 show processes 到 CoPP

Cisco Catalyst 交换机 CPU 占用过高怎么排查？本文用 show processes cpu 与 platform 输出区分进程占用还是上送 CPU 的流量，并给出 SISF、ARP 风暴与 CoPP 控制平面限速的完整处置流程。

admin admin 2026-09-12
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Cisco IOS XE Install Mode Upgrade: add, activate, commit

Cisco IOS XE Install Mode Upgrade: add, activate, commit

Cisco IOS XE install mode upgrade: add, activate, commit, plus three-step change windows, stack and StackWise Virtual behaviour, rollback and failure

admin admin 2026-09-10
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Catalyst 9300 StackWise vs StackWise Virtual: Which to Use?

Catalyst 9300 StackWise vs StackWise Virtual: Which to Use?

Compare Catalyst 9300 StackWise physical stacking with StackWise Virtual: bandwidth variants, member limits, dual-active detection and which tier each

admin admin 2026-09-08
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Cisco UDLD Configuration: Normal vs Aggressive Mode

Cisco UDLD Configuration: Normal vs Aggressive Mode

Configure UDLD on Cisco switches to detect unidirectional fiber links: normal vs aggressive mode, message interval, errdisable recovery and verificati

admin admin 2026-09-07
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Cisco Port Security and Sticky MAC: Violation Modes Explained

Cisco Port Security and Sticky MAC: Violation Modes Explained

Cisco port security violation modes explained: protect, restrict and shutdown behavior, violation triggers, counters, syslog messages and err-disable

admin admin 2026-09-05
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Cisco VTP Explained: Server, Client and Transparent Modes

Cisco VTP Explained: Server, Client and Transparent Modes

Cisco VTP modes explained: server, client, transparent and off, configuration revisions, advertisements, pruning, and how to avoid a VLAN database wip

admin admin 2026-09-05
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