Device Inspection - Comprehensive L1-L4

Applicable Scenarios

• Comprehensive network health assessment (all test devices)
• Full stack network inspection (L1-L4)
• Network baseline establishment and verification
• Pre-maintenance complete audit

Identification Signals

User questions contain: "inspect", "comprehensive", "full check", "all devices", "L1-L4"

Execution Strategy

1. List all devices in 'test' group using list_devices(group="test")
2. For each device, execute comprehensive inspection covering L1 (Physical), L2 (Data Link), L3 (Network), L4 (Transport)
3. Generate consolidated report with device-by-device status
4. Flag anomalies across all layers

Comprehensive Inspection Template (L1-L4)

L1 - Physical Layer

• show version

  (Device model, serial, uptime)

• show inventory

  (Hardware modules, power supplies, fans)

• show environment all

  (Temperature, power status, fan status)

• show interfaces

  (Physical port states, media types)

L2 - Data Link Layer

• show vlan brief

  (VLAN configuration and status)

• show spanning-tree summary

  (STP topology, root bridge)

• show spanning-tree detail

  (Port states, costs)

• show cdp neighbors

  (CDP neighbor discovery)

• show mac address-table

  (MAC table status, count)

L3 - Network Layer

• show ip route summary

  (Route count and protocol summary)

• show ip ospf neighbor

  (OSPF neighbor status)

• show ip ospf interface brief

  (OSPF interface states)

• show ip bgp summary

  (BGP neighbor status)

• show ip bgp vpnv4 all summary

  (VPNv4 status if applicable)

L4 - Transport Layer & Services

• show tcp brief

  (TCP session count)

• show processes cpu

  (CPU utilization and process breakdown)

• show memory statistics

  (Memory usage across memory pools)

• show interfaces counters errors

  (Error counters on all interfaces)

• show interfaces counters dropped

  (Dropped packet counters)

Report Format

Executive Summary

📋 test Network Comprehensive Inspection Report
Inspection Time: 2026-01-08 14:30:00
Total Devices: 8
Overall Status: 2 devices OK, 5 devices WARNING, 1 device CRITICAL

Device Summary:
├─ R1 (10.1.1.1) ✅ OK - L1:✅ L2:✅ L3:✅ L4:✅
├─ R2 (10.1.1.2) ⚠️ WARNING - L1:⚠️ L2:✅ L3:✅ L4:✅
├─ R3 (10.1.1.3) ⚠️ WARNING - L1:✅ L2:✅ L3:✅ L4:⚠️
├─ R4 (10.1.1.4) ⚠️ WARNING - L1:⚠️ L2:✅ L3:✅ L4:✅
├─ S1 (10.2.1.1) ✅ OK - L1:✅ L2:✅ L3:✅ L4:✅
├─ S2 (10.2.1.2) ⚠️ WARNING - L1:✅ L2:⚠️ L3:✅ L4:✅
├─ A1 (10.3.1.1) ⚠️ WARNING - L1:✅ L2:✅ L3:⚠️ L4:✅
└─ A2 (10.3.1.2) ❌ CRITICAL - L1:❌ L2:✅ L3:✅ L4:⚠️

Device-by-Device Detailed Results

Each device gets a full L1-L4 report:

╔══════════════════════════════════════════════════════╗
║ Device: R1 (10.1.1.1) - Core Router                 ║
║ Platform: Cisco IOS XE                              ║
║ Status: ✅ ALL SYSTEMS OK                           ║
╚══════════════════════════════════════════════════════╝

Layer 1 (Physical):
  CPU Utilization: 15% (5min avg) ✅
  Memory Usage: 62% (avaitestle: 8.2GB) ✅
  Temperature: 42°C (threshold: 70°C) ✅
  Power Supplies: 2/2 ACTIVE ✅
  Fans: 6/6 SPINNING ✅

Layer 2 (Data Link):
  VLAN Count: 45 ✅
  Active Ports: 48/48 UP ✅
  STP Root: YES (Priority: 24576) ✅
  LLDP Neighbors: 4 discovered ✅

Layer 3 (Network):
  IPv4 Routes: 2,847 routes ✅
  OSPF Neighbors: 3 FULL ✅
  BGP Neighbors: 2 ESTABLISHED ✅
  Routing Errors: 0 ✅

Layer 4 (Transport):
  Interface Errors: 0 (24h avg) ✅
  Dropped Packets: 0 (24h avg) ✅
  TCP Sessions: 45 active ✅
  UDP Flows: 128 active ✅

Anomaly Details & Recommendations

⚠️ WARNING: R2 - Temperature trending high
Current: 58°C | Trend: +2°C/hour | Threshold: 70°C
Recommendation: Monitor closely, ensure adequate airflow

❌ CRITICAL: A2 - Power supply #1 degraded
Status: FAILED | Uptime before failure: 847 days
Recommendation: Replace PSU immediately before other PSU fails

Consolidated Findings

Critical Issues (Immediate Action):
1. A2 Power Supply Failure - Replace PSU
2. A1 BGP Neighbor Flapping - Check link stability

Warnings (Monitor):
1. R2 Temperature trending up - Check cooling
2. S2 STP Bridge Priority - May need rebalancing
3. R3 Interface FCS Errors increasing - Check optics

Informational (Good Status):
- All core devices operating normally
- test network stable and well-managed

Multi-Device Inspection Process

1. Device Collection: Query all devices in 'test' group
2. Parallel Execution: Execute inspection template on each device
3. Data Aggregation: Collect and normalize results
4. Analysis: Compare against health baselines
5. Reporting: Generate comprehensive multi-device report with:
   • Overall network health score
   • Device-by-device status
   • Cross-layer dependency analysis
   • Consolidated recommendations

Output Artifact

reports/test-comprehensive-inspection-20260108-143000.md
├─ Executive Summary Dashboard
├─ Device Status Matrix
├─ Layer-by-Layer Details (8 devices × 4 layers = 32 sections)
├─ Anomaly Analysis
├─ Historical Comparison (vs. previous inspection)
└─ Recommendations & Actions