fix(get_config): strip valid_lft/preferred_lft — volatile DHCP fields cause false-positive config changes every poll

napalm_linux/linux.py

@@ -693,8 +693,17 @@ class LinuxDriver(OSDriver):
     def get_config(
         self, retrieve: str = "all", full: bool = False, sanitized: bool = False
     ) -> dict[str, Any]:
-        """Return minimal config representation (network interfaces only)."""
+        """Return minimal config representation (network interfaces only).
+
+        ``valid_lft`` / ``preferred_lft`` fields from DHCP leases are stripped
+        so the output is stable across polls and does not produce false-positive
+        config-change events in the config-backup feature.
+        """
+        import re
+
         running = self._send("ip addr show && ip route show")
+        # Strip volatile DHCP lease timer fields — they decrement every poll
+        running = re.sub(r"\s+valid_lft\s+\S+\s+preferred_lft\s+\S+", "", running)
         return {"running": running, "startup": "", "candidate": ""}
 
     # ------------------------------------------------------------------