troubleshooting 归档 - 第3页 共26页 - 夜莺博客

标签：troubleshooting

Junos OSPF Adjacency Stuck in ExStart or Exchange

Junos OSPF Adjacency Stuck in ExStart or Exchange

Diagnose Junos OSPF neighbors stuck in ExStart or Exchange: MTU mismatch, firewall filters on lo0, traceoptions commands and the fixes that work.

admin admin 2026-09-30
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Junos SRX Flow Session Debugging: Commands in Order

Junos SRX Flow Session Debugging: Commands in Order

Debug SRX session and flow problems without committing traceoptions: show security flow session filters, monitor security flow and datapath capture.

admin admin 2026-09-29
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Cisco Nexus FEX Troubleshooting: FEX Not Coming Online

Cisco Nexus FEX Troubleshooting: FEX Not Coming Online

Diagnose Cisco Nexus fabric extender problems: show fex states, fabric port pinning, host interface errors, image sync and vPC dual-homing issues.

admin admin 2026-09-29
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Cisco IOS XR: Troubleshoot Processes, CPU and Memory

Cisco IOS XR: Troubleshoot Processes, CPU and Memory

Troubleshoot Cisco IOS XR CPU and memory: show processes cpu, blocked process checks, memory compare reports, and restarting a stuck process safely.

admin admin 2026-09-28
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Fiber Connector Inspection and Cleaning Guide

Fiber Connector Inspection and Cleaning Guide

Dirty endfaces cause up to half of fiber faults. Learn IEC 61300-3-35 inspection, wet-to-dry cleaning, and how to fit it into an optical loss budget.

admin admin 2026-09-26
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IPv6 Path MTU Discovery and ICMPv6 Packet Too Big

IPv6 Path MTU Discovery and ICMPv6 Packet Too Big

Why IPv6 sessions establish and then hang: PMTUD depends on ICMPv6 Packet Too Big. Learn how to diagnose black-hole MTU problems and fix the filtering

admin admin 2026-09-26
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TCAM and FIB Scaling: Why Routes Don't Install

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 admin 2026-09-24
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Cisco IOS IP SLA and Object Tracking Failover

Cisco IOS IP SLA and Object Tracking Failover

Build reliable dual-ISP failover with Cisco IP SLA and object tracking: probe types, delay up/down dampening, tracked static routes, boolean lists and

admin admin 2026-09-23
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PTP IEEE 1588 Boundary Clock Configuration Guide

PTP IEEE 1588 Boundary Clock Configuration Guide

Configure IEEE 1588 PTP boundary clocks: clock types, BMCA, telecom profiles G.8275.1/G.8275.2, clock-ports, transport modes and verification commands

admin admin 2026-09-23
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Cisco Flexible NetFlow Configuration Step by Step

Cisco Flexible NetFlow Configuration Step by Step

Configure Flexible NetFlow on Cisco IOS XE: flow record key and nonkey fields, flow exporter, flow monitor, interface application and verification com

admin admin 2026-09-23
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