cisco 归档 - 第5页共21页

Cisco Nexus 9300 vs 9500: Leaf and Spine Selection

Fixed 1RU leaves or modular chassis spines? How to choose between Cisco Nexus 9300 and 9500 using oversubscription, uplink speed, buffers and redundan

admin 2026-09-26

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Cisco Catalyst Center Plug and Play Device Onboarding

Onboard factory-fresh switches into Cisco Catalyst Center with Plug and Play: PnP startup VLAN, DHCP option 43, DNS discovery and the phone-home fallb

admin 2026-09-25

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DHCP Option 82 and IP Source Guard on Access Ports

Lock down an access layer with DHCP snooping, option 82 insertion and IP source guard: the binding table, port trust rules, and the order that avoids

admin 2026-09-24

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Control Plane Policing (CoPP): Protecting the CPU

Configure CoPP so a flood of ARP, ICMP or routing packets cannot take down a switch: class maps, policy maps, default policies and safe tuning rules.

admin 2026-09-24

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TCAM and FIB Scaling: Why Routes Don't Install

Diagnose routes that exist in the RIB but never reach hardware: TCAM regions, host route explosion, verification commands and the design changes that

admin 2026-09-24

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Cisco IOS-XE Guest Shell: On-Box Python Automation

Enable and use IOS-XE Guest Shell for on-box automation: IOX prerequisites, container networking, running Python and bash, and NETCONF from inside the

admin 2026-09-24

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Ansible Network Resource Modules: Declarative Config

Use Ansible network resource modules to manage switch configuration declaratively: facts gathering, state merged versus replaced, and idempotent verif

admin 2026-09-24

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IPv6 First Hop Security: RA Guard and DHCPv6 Guard

Stop rogue IPv6 routers and DHCPv6 servers on your access layer with RA Guard, DHCPv6 Guard, IPv6 snooping and source guard, configured on Cisco Catal

admin 2026-09-24

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WRED vs Tail Drop: Congestion Avoidance Explained

How WRED differs from tail drop, what the min/max thresholds and mark probability denominator actually do, and how to size them without dropping good

admin 2026-09-24

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MACsec Switch-to-Switch Encryption with MKA

Configure MACsec on Cisco switches: MKA key chains with CKN and CAK, policy on the interface, verification with show macsec, and where it fits versus

admin 2026-09-23

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