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标签：catalyst

Cisco DHCP Snooping: Trusted and Untrusted Ports

Cisco DHCP Snooping: Trusted and Untrusted Ports

Cisco DHCP snooping: enable it per VLAN, trust server ports, rate-limit starvation floods, persist the binding database and verify with show commands.

admin admin 2026-09-04
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Cisco Voice VLAN Setup for IP Phones (Auxiliary VLAN)

Cisco Voice VLAN Setup for IP Phones (Auxiliary VLAN)

Configure the Cisco voice VLAN on Catalyst access ports: switchport voice vlan modes, QoS trust, LLDP-MED, uplink trunks and phone registration troubl

admin admin 2026-09-04
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Catalyst 9300 StackWise: 320, 480 and 1T Bandwidth Explained

Catalyst 9300 StackWise: 320, 480 and 1T Bandwidth Explained

Catalyst 9300 StackWise decoded: StackWise-320 vs 480 vs 1T, ring maths, SRP doubling, uplink sizing and how to verify the stack.

admin admin 2026-09-03
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Catalyst 9300 StackWise vs StackWise Virtual: Deployment Guide

Catalyst 9300 StackWise vs StackWise Virtual: Deployment Guide

Catalyst 9300 StackWise-480/1T vs StackWise Virtual on 9500/9600: platform support, licensing, distance limits, dual-active detection and design rules

admin admin 2026-09-02
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Cisco Catalyst Port Security: Sticky MAC and Violation Modes

Cisco Catalyst Port Security: Sticky MAC and Violation Modes

Hands-on Cisco Catalyst port security with sticky MAC: step-by-step config, aging, plus how to read show port-security output and troubleshoot violati

admin admin 2026-08-31
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Cisco StackWise vs VSS vs StackWise Virtual: Full Comparison

Cisco StackWise vs VSS vs StackWise Virtual: Full Comparison

StackWise vs VSS vs StackWise Virtual: member limits, cable types, platform support (9300 cannot run SVL), failover, ISSU upgrades and how to choose o

admin admin 2026-08-31
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Cisco Catalyst 9300 StackWise vs VSS: Which Stacking Technology

Cisco Catalyst 9300 StackWise vs VSS: Which Stacking Technology

Step-by-step Catalyst 9300 stacking: cabling and power-up order, priorities, renumbering, verification commands, SVL dual-active detection and member

admin admin 2026-08-30
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Troubleshoot MAC Flaps and Layer 2 Loops on Catalyst Switches

Troubleshoot MAC Flaps and Layer 2 Loops on Catalyst Switches

Fix MAC flapping on Cisco Catalyst switches: read %SW_MATM-4-MACFLAP_NOTIF logs, trace the flapping MAC hop by hop, and apply UDLD and storm control.

admin admin 2026-08-27
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Troubleshoot STP Issues on Cisco Catalyst Switches

Troubleshoot STP Issues on Cisco Catalyst Switches

Diagnose Cisco Catalyst STP loops and flooding: locate the loop, check BPDU loss and duplex mismatches, then harden with BPDU Guard, Root Guard and UD

admin admin 2026-08-27
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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 admin 2026-08-25
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