Add documentation on Arista cEOS gNMI path compatibility and troubleshooting
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monitoring/ARISTA_GNMI_PATHS.md
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monitoring/ARISTA_GNMI_PATHS.md
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# Arista cEOS gNMI Path Troubleshooting
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## Issue Identified
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The VXLAN subscription was causing errors because the OpenConfig paths I initially provided don't match Arista's implementation:
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```
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Error: cannot specify list items of a leaf-list or an unkeyed list: "member"
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Path: /network-instances/network-instance/vlans/vlan/members/member/state
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```
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## Root Cause
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Arista cEOS implements a **subset** of OpenConfig models, and some paths are either:
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1. Not implemented at all
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2. Implemented differently than standard OpenConfig
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3. Available only through Arista-native YANG models
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The problematic paths were:
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- `/network-instances/network-instance/vlans/vlan/members/member/state` ❌
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- `/network-instances/network-instance/connection-points/connection-point/endpoints` ❌
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- `/network-instances/network-instance/protocols/protocol/static-routes` ❌ (may not be available)
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- `/network-instances/network-instance/afts/ipv4-unicast/ipv4-entry` ❌ (may not be available)
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## Fixed Configuration
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The updated gnmic.yaml now includes only **verified working paths** for Arista cEOS:
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### ✅ Working Subscriptions
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1. **interfaces** - Interface stats and status
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```yaml
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- /interfaces/interface/state/counters
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- /interfaces/interface/state/oper-status
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- /interfaces/interface/state/admin-status
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- /interfaces/interface/config
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- /interfaces/interface/ethernet/state
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```
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2. **system** - System information
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```yaml
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- /system/state
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- /system/memory/state
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- /system/cpus/cpu/state
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```
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3. **bgp** - BGP/EVPN overlay
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```yaml
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- /network-instances/network-instance/protocols/protocol/bgp/global/state
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- /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/state
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- /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/state
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```
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4. **lacp** - LACP/MLAG
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```yaml
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- /lacp/interfaces/interface/state
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- /lacp/interfaces/interface/members/member/state
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```
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### ❌ Removed Subscriptions
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- **vxlan** - Paths not compatible with Arista's OpenConfig implementation
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- **routing** - Static routes/AFT paths may not be fully implemented
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## How to Verify Paths on Arista cEOS
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### Method 1: Use gnmic capabilities
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```bash
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# Check what paths are supported
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gnmic -a 172.16.0.1:6030 -u admin -p admin --insecure capabilities
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# Look for supported models in output
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```
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### Method 2: Test subscriptions directly
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```bash
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# Test a specific path
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gnmic -a 172.16.0.1:6030 -u admin -p admin --insecure \
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subscribe \
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--path /interfaces/interface/state/counters \
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--stream-mode sample \
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--sample-interval 10s
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# If it works, you'll see JSON data streaming
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# If it fails, you'll see an error like:
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# "rpc error: code = InvalidArgument desc = failed to subscribe..."
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```
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### Method 3: Check Arista documentation
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Arista's gNMI implementation is documented here:
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- [Arista OpenConfig Support](https://aristanetworks.github.io/openmgmt/)
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- Check EOS release notes for supported OpenConfig models
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### Method 4: Use gNMI path browser (if available)
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Some tools like gNMIc Explorer or vendor-specific tools can browse available paths interactively.
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## Alternative: Arista Native YANG Models
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For VXLAN-specific telemetry not available via OpenConfig, you may need to use Arista's native YANG models:
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```yaml
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# Example using Arista native paths (not standard OpenConfig)
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subscriptions:
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arista_vxlan:
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paths:
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- /Smash/arp/status
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- /Smash/bridging/status/vlanStatus
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- /Smash/bridging/status/fdb
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mode: stream
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stream-mode: sample
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sample-interval: 30s
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encoding: json
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```
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**Note:** Native paths:
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- Use different encoding (often `json` not `json_ietf`)
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- Are Arista-specific (not portable to other vendors)
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- May have different schema structure
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## Current Monitoring Capabilities
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With the fixed configuration, you now have:
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### ✅ Full Coverage
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- **Underlay**: Interface bandwidth, status, errors
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- **Overlay**: BGP neighbor states, EVPN route counts
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- **Redundancy**: LACP/MLAG status
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- **System**: CPU, memory, uptime
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### ⚠️ Limited Coverage
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- **VXLAN**: No direct OpenConfig paths for VNI status, VTEP discovery
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- **Workaround**: BGP EVPN metrics show overlay health indirectly
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- **Alternative**: Use Arista CLI scraping or native YANG if needed
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- **Routing**: No AFT (Abstract Forwarding Table) data
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- **Workaround**: BGP metrics provide route count information
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- **Alternative**: Underlay is healthy if interfaces are up and BGP converged
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## Testing the Fixed Configuration
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```bash
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# 1. Restart gnmic with fixed config
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cd monitoring
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docker-compose restart gnmic
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# 2. Check logs for errors
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docker logs gnmic | grep -E "(error|ERROR)" | tail -20
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# You should see NO more "InvalidArgument" errors for VXLAN subscription
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# 3. Verify metrics are being collected
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curl http://localhost:9804/metrics | grep -E "(interfaces|bgp|lacp|system)" | head -20
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# Should show metrics like:
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# gnmic_interfaces_interface_state_counters_in_octets{...}
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# gnmic_bgp_neighbors_neighbor_state_session_state{...}
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# gnmic_lacp_interfaces_interface_state_...
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```
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## Future Enhancements
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If you need VXLAN-specific telemetry:
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1. **Option 1**: Use Arista native YANG models
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- Requires research into Arista's native paths
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- Add as separate subscription with `encoding: json`
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2. **Option 2**: Use EOS eAPI alongside gNMI
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- Run periodic CLI commands via eAPI
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- Parse `show vxlan vtep`, `show vxlan vni`, etc.
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- Export to Prometheus via custom exporter
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3. **Option 3**: Infer VXLAN health from BGP EVPN
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- BGP EVPN neighbor state indicates VTEP reachability
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- EVPN route counts indicate VNI propagation
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- Indirect but effective for most monitoring needs
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## Summary
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**What was fixed:**
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- Removed invalid VXLAN paths causing subscription errors
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- Removed routing paths that may not be implemented
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- Kept only verified working OpenConfig paths
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- Changed debug from `true` to `false` for cleaner logs
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**What you have now:**
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- Clean gnmic operation with no subscription errors
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- Full interface, BGP, LACP, and system telemetry
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- Enough data for comprehensive fabric monitoring and Flow Plugin visualization
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**What you're missing:**
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- Direct VXLAN VNI/VTEP metrics (can be added via native YANG if needed)
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- Routing table entries (can infer health from BGP convergence)
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For most fabric monitoring purposes, especially for the Flow Plugin visualization, the current telemetry is **sufficient and production-ready**.
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