241 lines
7.0 KiB
Markdown
241 lines
7.0 KiB
Markdown
# VPP SNMP AgentX Bridge
|
|
|
|
A Go application that bridges VPP (Vector Packet Processing) interface statistics to SNMP using the AgentX protocol. It queries VPP interface counters and exposes them via the standard IF-MIB (1.3.6.1.2.1.31.1.1.1) for SNMP monitoring.
|
|
|
|
## Features
|
|
|
|
- **Real-time VPP interface statistics** via SNMP
|
|
- **Standard IF-MIB compliance** (ifXTable)
|
|
- **AgentX protocol support** (TCP and Unix sockets)
|
|
- **Configurable interface index offset** to avoid conflicts
|
|
- **Configurable polling intervals**
|
|
- **Thread-safe operation** with proper synchronization
|
|
|
|
## Architecture
|
|
|
|
```
|
|
VPP Stats Socket → VPP Stats Client → Interface MIB → AgentX → SNMP Master Agent
|
|
```
|
|
|
|
The application consists of three main components:
|
|
|
|
1. **VPP Stats Client** (`vppstats/`): Connects to VPP stats socket and retrieves interface counters
|
|
2. **Interface MIB** (`ifmib/`): Maps VPP statistics to SNMP IF-MIB structure
|
|
3. **AgentX Client**: Registers with SNMP master agent to serve the MIB data
|
|
|
|
## Build Instructions
|
|
|
|
### Development Build
|
|
|
|
```bash
|
|
go build -o vpp-snmp-agent .
|
|
```
|
|
|
|
### Static Binary Build
|
|
|
|
For deployment without Go runtime dependencies:
|
|
|
|
```bash
|
|
# Linux static binary
|
|
CGO_ENABLED=0 GOOS=linux go build -a -ldflags '-extldflags "-static"' -o vpp-snmp-agent .
|
|
|
|
# Cross-compile for different architectures
|
|
CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -ldflags '-extldflags "-static"' -o vpp-snmp-agent-linux-amd64 .
|
|
CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -a -ldflags '-extldflags "-static"' -o vpp-snmp-agent-linux-arm64 .
|
|
```
|
|
|
|
### Release Build with Version Info
|
|
|
|
```bash
|
|
VERSION=$(git describe --tags --always --dirty)
|
|
BUILD_TIME=$(date -u '+%Y-%m-%d_%H:%M:%S')
|
|
CGO_ENABLED=0 go build -ldflags "-X main.version=${VERSION} -X main.buildTime=${BUILD_TIME}" -o vpp-snmp-agent .
|
|
```
|
|
|
|
## Usage
|
|
|
|
### Basic Usage
|
|
|
|
```bash
|
|
# Run with default settings
|
|
./vpp-snmp-agent
|
|
|
|
# Run with custom AgentX address
|
|
./vpp-snmp-agent -agentx-addr 127.0.0.1:705
|
|
|
|
# Run with Unix socket AgentX connection
|
|
./vpp-snmp-agent -agentx-addr /var/agentx/master
|
|
```
|
|
|
|
### Command Line Flags
|
|
|
|
| Flag | Default | Description |
|
|
|------|---------|-------------|
|
|
| `-agentx-addr` | `localhost:705` | AgentX master agent address (hostname:port or Unix socket path) |
|
|
| `-vpp-stats-addr` | `/var/run/vpp/stats.sock` | VPP statistics socket path |
|
|
| `-period` | `10.0` | Interval in seconds for querying VPP interface stats |
|
|
| `-vpp-ifindex-offset` | `1000` | Offset to add to VPP interface indices for SNMP |
|
|
|
|
### Examples
|
|
|
|
```bash
|
|
# Custom polling interval (5 seconds)
|
|
./vpp-snmp-agent -period 5.0
|
|
|
|
# Custom VPP stats socket
|
|
./vpp-snmp-agent -vpp-stats-addr /custom/path/stats.sock
|
|
|
|
# Custom interface index offset (start at 2000)
|
|
./vpp-snmp-agent -vpp-ifindex-offset 2000
|
|
|
|
# Full configuration
|
|
./vpp-snmp-agent \
|
|
-agentx-addr /var/agentx/master \
|
|
-vpp-stats-addr /var/run/vpp/stats.sock \
|
|
-period 5.0 \
|
|
-vpp-ifindex-offset 1000
|
|
```
|
|
|
|
## SNMP Interface Mapping
|
|
|
|
VPP interfaces are mapped to SNMP indices with a configurable offset (default 1000):
|
|
|
|
- **VPP Interface 0** → **SNMP Index 1000**
|
|
- **VPP Interface 1** → **SNMP Index 1001**
|
|
- **VPP Interface N** → **SNMP Index (N + offset)**
|
|
|
|
## Supported MIB Objects
|
|
|
|
The application implements the ifXTable (1.3.6.1.2.1.31.1.1.1) with the following objects:
|
|
|
|
| OID | Object | Type | Description |
|
|
|-----|--------|------|-------------|
|
|
| `.1.{index}` | ifName | DisplayString | Interface name |
|
|
| `.2.{index}` | ifInMulticastPkts | Counter32 | RX multicast packets |
|
|
| `.3.{index}` | ifInBroadcastPkts | Counter32 | RX broadcast packets |
|
|
| `.4.{index}` | ifOutMulticastPkts | Counter32 | TX multicast packets |
|
|
| `.5.{index}` | ifOutBroadcastPkts | Counter32 | TX broadcast packets |
|
|
| `.6.{index}` | ifHCInOctets | Counter64 | RX bytes (high capacity) |
|
|
| `.7.{index}` | ifHCInUcastPkts | Counter64 | RX unicast packets (high capacity) |
|
|
| `.8.{index}` | ifHCInMulticastPkts | Counter64 | RX multicast packets (high capacity) |
|
|
| `.9.{index}` | ifHCInBroadcastPkts | Counter64 | RX broadcast packets (high capacity) |
|
|
| `.10.{index}` | ifHCOutOctets | Counter64 | TX bytes (high capacity) |
|
|
| `.11.{index}` | ifHCOutUcastPkts | Counter64 | TX unicast packets (high capacity) |
|
|
| `.12.{index}` | ifHCOutMulticastPkts | Counter64 | TX multicast packets (high capacity) |
|
|
| `.13.{index}` | ifHCOutBroadcastPkts | Counter64 | TX broadcast packets (high capacity) |
|
|
|
|
## SNMP Query Examples
|
|
|
|
### Query Interface Names
|
|
|
|
```bash
|
|
# Get all interface names
|
|
snmpwalk -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1.1
|
|
|
|
# Get specific interface name (interface 0 with default offset)
|
|
snmpget -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1.1.1000
|
|
```
|
|
|
|
### Query Interface Counters
|
|
|
|
```bash
|
|
# Get RX bytes for interface 0
|
|
snmpget -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1.6.1000
|
|
|
|
# Get TX bytes for interface 1
|
|
snmpget -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1.10.1001
|
|
|
|
# Walk all interface counters
|
|
snmpwalk -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1
|
|
```
|
|
|
|
### Query with Custom Offset
|
|
|
|
If running with `-vpp-ifindex-offset 2000`:
|
|
|
|
```bash
|
|
# Interface 0 counters at index 2000
|
|
snmpget -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1.6.2000
|
|
```
|
|
|
|
## Prerequisites
|
|
|
|
### VPP Requirements
|
|
|
|
- VPP must be running with stats socket enabled
|
|
- Stats socket accessible at `/var/run/vpp/stats.sock` (or custom path)
|
|
- Application must have read permissions on the stats socket
|
|
|
|
### SNMP Requirements
|
|
|
|
- SNMP master agent running (net-snmp's snmpd)
|
|
- AgentX protocol enabled in snmpd configuration
|
|
- AgentX socket accessible (TCP port 705 or Unix socket)
|
|
|
|
### SNMP Agent Configuration
|
|
|
|
Add to `/etc/snmp/snmpd.conf`:
|
|
|
|
```
|
|
# Enable AgentX
|
|
master agentx
|
|
agentXSocket tcp:localhost:705
|
|
# or for Unix socket:
|
|
# agentXSocket /var/agentx/master
|
|
```
|
|
|
|
## Troubleshooting
|
|
|
|
### Common Issues
|
|
|
|
1. **"Failed to connect to VPP stats"**
|
|
- Check VPP is running: `vppctl show version`
|
|
- Verify stats socket exists: `ls -la /var/run/vpp/stats.sock`
|
|
- Check permissions on stats socket
|
|
|
|
2. **"Failed to dial AgentX"**
|
|
- Verify SNMP agent is running: `systemctl status snmpd`
|
|
- Check AgentX is enabled in snmpd.conf
|
|
- Test AgentX socket: `netstat -ln | grep 705`
|
|
|
|
3. **"Failed to register IF-MIB: ErrorDuplicateRegistration"**
|
|
- Another agent is already serving the IF-MIB
|
|
- Check with: `snmpwalk -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1`
|
|
|
|
4. **"Retrieved stats for 0 interfaces"**
|
|
- VPP may have no interfaces configured
|
|
- Check VPP interfaces: `vppctl show interface`
|
|
|
|
### Debug Commands
|
|
|
|
```bash
|
|
# Check VPP interfaces
|
|
vppctl show interface
|
|
|
|
# Check VPP stats
|
|
vppctl show stats
|
|
|
|
# Test SNMP master agent
|
|
snmpwalk -v2c -c public localhost 1.3.6.1.2.1.1
|
|
|
|
# Check AgentX registration
|
|
snmpwalk -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1
|
|
```
|
|
|
|
## License
|
|
|
|
This project uses the LGPL 3.0 licensed go-agentx library.
|
|
|
|
## Contributing
|
|
|
|
1. Fork the repository
|
|
2. Create a feature branch
|
|
3. Make your changes
|
|
4. Add tests if applicable
|
|
5. Submit a pull request
|
|
|
|
## Version History
|
|
|
|
- **v1.0.0**: Initial release with IF-MIB support
|
|
- **v1.1.0**: Added configurable interface index offset
|
|
- **v1.2.0**: Added Unix socket support for AgentX |