troubleshooting 归档 - 夜莺博客

标签：troubleshooting

Jumbo Frames MTU Mismatch: Diagnosing Silent Drops

Jumbo Frames MTU Mismatch: Diagnosing Silent Drops

Diagnose jumbo frame failures: find the device with the low MTU using DF-bit pings, fix it, and understand why large pings fail only to some hosts.

admin admin 2026-10-08
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Paris Traceroute: Finding Paths in ECMP Networks

Paris Traceroute: Finding Paths in ECMP Networks

Classic traceroute lies in load-balanced networks. Use Paris traceroute for consistent flow-based paths, and multipath discovery to enumerate every EC

admin admin 2026-10-06
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Per-Process Linux Network Bandwidth Monitoring Tools

Per-Process Linux Network Bandwidth Monitoring Tools

Compare iftop, nethogs, vnstat, nload and bmon for Linux bandwidth monitoring, with commands, accuracy caveats and when each tool is the right choice.

admin admin 2026-10-06
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MPLS LSP Ping and Traceroute: Data Plane Verification

MPLS LSP Ping and Traceroute: Data Plane Verification

MPLS LSP ping and LSP traceroute verify the label data plane, not just the control plane. FEC types, reply modes and return codes explained with IOS X

admin admin 2026-10-06
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Cisco IOS XR ACL Configuration and Verification

Cisco IOS XR ACL Configuration and Verification

Configure and verify access lists on Cisco IOS XR: extended ACLs, sequence numbering, counter checks, object groups and the mistakes that silently dro

admin admin 2026-10-05
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Arista EOS SVI Down: Inter-VLAN Routing Troubleshooting

Arista EOS SVI Down: Inter-VLAN Routing Troubleshooting

Why an Arista EOS SVI stays down/down: no forwarding member port, VLAN missing, ip routing disabled, plus the show commands that prove each cause.

admin admin 2026-10-03
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Junos Interface Damping: Suppress Physical Link Flaps

Junos Interface Damping: Suppress Physical Link Flaps

Configure Junos physical interface damping to stop a flapping link flooding routing protocols: penalty 1000, suppress and reuse levels, hold-time guid

admin admin 2026-10-03
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Dell OS10 default interface: Reset Ports to Factory Default

Dell OS10 default interface: Reset Ports to Factory Default

How to use the Dell SmartFabric OS10 default interface command to clear port settings, why VLT discovery interfaces block it, and how to verify the re

admin admin 2026-10-03
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Cisco IOS XR Configuration Management: Commit and Rollback

Cisco IOS XR Configuration Management: Commit and Rollback

Master IOS XR configuration management: target versus running config, commit confirmed, rollback to a commit ID, load replace and diffing changes.

admin admin 2026-10-02
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Catalyst 9300 StackWise Virtual Dual-Active Detection

Catalyst 9300 StackWise Virtual Dual-Active Detection

StackWise Virtual on Catalyst 9300 and 9600: how the virtual switch link works, why dual-active detection is mandatory, and the configuration steps.

admin admin 2026-10-02
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