# SNMP Troubleshooting

**Troubleshooting**:\
Ensure that you can successfully SNMP poll for interface names and descriptions:

| OID                       | Symbolic Name | Description                                              | Example Value                             | Purpose                                               |
| ------------------------- | ------------- | -------------------------------------------------------- | ----------------------------------------- | ----------------------------------------------------- |
| `1.3.6.1.2.1.31.1.1.1.1`  | `ifName`      | Logical name of the interface (often OS-specific)        | `eth0`, `Gi0/1`, `ge-0/0/0`               | Used for identifying interfaces by name               |
| `1.3.6.1.2.1.2.2.1.2`     | `ifDescr`     | Human-readable description (often from the OS or vendor) | `Intel 82574L Gigabit`, `FastEthernet0/1` | Legacy and commonly supported identifier              |
| `1.3.6.1.2.1.31.1.1.1.18` | `ifAlias`     | Admin-defined alias or description string                | `Uplink to Core Switch`, `DMZ`            | Allows admins to label interfaces with custom notes   |
| `1.3.6.1.2.1.2.2.1.3`     | `ifType`      | Integer value representing the interface type            | `6` = Ethernet, `24` = Loopback           | Used for filtering by physical/logical interface type |

```
# SNMPv2c Walk Example (using community string)
snmpwalk -v2c \
  -c <COMMUNITY> \                      # SNMP community string (e.g., 'public')
  <HOST> \                              # Target device IP or hostname
  1.3.6.1.2.1.31.1.1.1.1 \              # ifName - Interface name
  1.3.6.1.2.1.31.1.1.1.18 \             # ifAlias - Admin-defined alias
  1.3.6.1.2.1.2.2.1.2 \                 # ifDescr - Interface description
  1.3.6.1.2.1.2.2.1.3                   # ifType - Interface type (numeric code)
```

```
# SNMPv3 Walk Example (authPriv security level using SHA-1 and AES-128)
snmpwalk -v3 \
  -l authPriv \                         # Security level: authentication and privacy
  -u <USER> \                           # SNMPv3 username
  -a SHA \                              # Authentication protocol (SHA-1)
  -A <AUTH_PASS> \                      # Authentication password
  -x AES \                              # Privacy protocol (AES-128)
  -X <PRIV_PASS> \                      # Privacy password
  <HOST> \                              # Target device IP or hostname
  1.3.6.1.2.1.31.1.1.1.1 \              # ifName - Interface name
  1.3.6.1.2.1.2.2.1.2 \                 # ifDescr - Interface description
  1.3.6.1.2.1.31.1.1.1.18 \             # ifAlias - Admin-defined alias
  1.3.6.1.2.1.2.2.1.3                   # ifType - Interface type (numeric code)
```


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