troubleshooting 归档 - 第13页 共26页 - 夜莺博客

标签：troubleshooting

Cisco IOS XR Commit Replace and Rollback Configuration

Cisco IOS XR Commit Replace and Rollback Configuration

Use commit replace to wipe or rebuild the IOS XR running configuration, and roll back to any labeled commit on ASR 9000, NCS and 8000 routers safely.

admin admin 2026-09-07
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ArubaOS-CX LLDP: Transmit, Receive and Verification

ArubaOS-CX LLDP: Transmit, Receive and Verification

Configure LLDP on ArubaOS-CX: enable the agent, set per-port transmit and receive, tune timers and traps, and verify neighbours with show lldp.

admin admin 2026-09-07
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Arista EOS MAC Address Table: Show Commands and Aging

Arista EOS MAC Address Table: Show Commands and Aging

Arista EOS MAC address table (FDB) commands: show mac address-table, dynamic vs static entries, aging timers, hardware limits and flapping-MAC trouble

admin admin 2026-09-06
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Cisco IOS Password Recovery: config-register 0x2142 Method

Cisco IOS Password Recovery: config-register 0x2142 Method

Cisco IOS password recovery with config-register 0x2142: break to ROMMON, confreg, restore startup-config, reset credentials and register.

admin admin 2026-09-06
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dig and nslookup: DNS Troubleshooting Commands Explained

dig and nslookup: DNS Troubleshooting Commands Explained

Diagnose DNS failures with dig and nslookup: read status codes and flags, query specific resolvers, use dig +trace, validate DNSSEC and fix common fai

admin admin 2026-09-06
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tcpdump Command Examples: Filters and Practical Packet Capture

tcpdump Command Examples: Filters and Practical Packet Capture

Practical tcpdump command examples: interface selection, BPF host/port/protocol filters, pcap capture files, output reading and troubleshooting recipe

admin admin 2026-09-06
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Linux tc netem: Simulate Latency, Packet Loss and Jitter

Linux tc netem: Simulate Latency, Packet Loss and Jitter

Simulate latency, jitter, packet loss, corruption and reordering on Linux with tc netem, scope the impairment to one flow, then verify and clean up.

admin admin 2026-09-04
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Cisco EEM Applets: Automate with event syslog Triggers

Cisco EEM Applets: Automate with event syslog Triggers

Automate Cisco IOS responses with Embedded Event Manager applets: syslog, SNMP and timer triggers, CLI actions, alerting, testing and production-safe

admin admin 2026-09-04
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Junos Storm Control Configuration for BUM Traffic

Junos Storm Control Configuration for BUM Traffic

Protect Junos EX and QFX switches from storms: configure storm control profiles, bandwidth levels, shutdown and autorecovery actions, plus verificatio

admin admin 2026-09-04
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MC-LAG ICCP Failure: LACP System ID Behavior on Junos

MC-LAG ICCP Failure: LACP System ID Behavior on Junos

MC-LAG ICCP failure on Junos rewrites the LACP system ID in every LACPDU. See the packet-level behavior, TLV fields, failure timeline and verification

admin admin 2026-09-04
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